Flea

Flea, the common name for the order Siphonaptera, includes 2,500 species of small flightless insects that survive as external parasites of mammals and birds. Fleas live by consuming blood or hematophagy, from their hosts. Adult fleas grow to about 3 mm or 0.12 in long, are usually brown, and have bodies that are "flattened" sideways or narrow, enabling them to move through their host's fur or feathers. They lack wings, but have strong claws preventing them from being dislodged, mouthparts adapted for piercing skin and sucking blood, and hind legs extremely well adapted for jumping. They are able to leap a distance of some 50 times their body length, a feat second only to jumps made by another group of insects, the superfamily of froghoppers. Fleas' larvae are worm-like with no limbs; they have chewing mouthparts and feed on organic debris left on their host's skin.

The Siphonaptera are most closely related to the snow scorpionflies, or snow fleas in the UK, formally the Boreidae, placing them within the Endopterygote insect order Mecoptera. Fleas arose in the early Cretaceous, most likely as ectoparasites of mammals, before moving on to other groups, including birds. Each species of flea is more or less a specialist with respect to its host animal species: many species never breed on any other host, though some are less selective. Some families of fleas are exclusive to a single host group; for example, the Malacopsyllidae are found only on armadillos, the Ischnopsyllidae only on bats, and the Chimaeropsyllidae only on elephant shrews.

The oriental rat flea, Xenopsylla cheopis, is a vector of Yersinia pestis, the bacterium which causes bubonic plague. The disease was spread to humans by rodents such as the black rat, which were bitten by infected fleas. Major outbreaks included the Plague of Justinian, c. 540 and the Black Death, c. 1350, both of which killed a sizeable fraction of the world's population.

Fleas appear in human culture in such diverse forms as flea circuses, poems like John Donne's erotic The Flea, works of music such as by Modest Mussorgsky, and a film by Charlie Chaplin.

Fleas
Temporal range: Early Cretaceous–Recent
Flea Scanning Electron Micrograph False Color
False colour scanning electron micrograph of a flea. CDC image.
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
(unranked): Eumetabola
(unranked): Endopterygota
Superorder: Panorpida
Order: Siphonaptera
Latreille, 1825
Suborders

Ceratophyllomorpha
Hystrichopsyllomorpha
Pulicomorpha
Pygiopsyllomorpha

Synonyms

Aphaniptera

Morphology and behavior

Fleas are wingless insects, 1/16 to 1/8-inch (1.5 to 3.3 mm) long, that are agile, usually dark colored (for example, the reddish-brown of the cat flea), with a proboscis, or stylet, adapted to feeding by piercing the skin and sucking their host's blood through their epipharynx. Flea legs end in strong claws that are adapted to grasp a host.[1]

Unlike other insects, fleas do not possess compound eyes but instead only have simple eyespots with a single biconvex lens; some species lack eyes altogether.[2] Their bodies are laterally compressed, permitting easy movement through the hairs or feathers on the host's body (or in the case of humans, under clothing). The flea body is covered with hard plates called sclerites.[1] These sclerites are covered with many hairs and short spines directed backward, which also assist its movements on the host. The tough body is able to withstand great pressure, likely an adaptation to survive attempts to eliminate them by scratching.[3]

Fleas lay tiny, white, oval eggs. The larvae are small and pale, have bristles covering their worm-like bodies, lack eyes, and have mouth parts adapted to chewing. The larvae feed on organic matter, especially the feces of mature fleas, which contain dried blood. Adults feed only on fresh blood.[4]

Jumping

Their legs are long, the hind pair well adapted for jumping; a flea can jump vertically up to 7 in (18 cm) and horizontally up to 13 in (33 cm),[5] making the flea one of the best jumpers of all known animals (relative to body size), second only to the froghopper. The flea jump is so rapid and forceful that it exceeds the capabilities of muscle, and instead of relying on direct muscle power, fleas store muscle energy in a pad of the elastic protein named resilin before releasing it rapidly (like a human using a bow and arrow).[6] Immediately before the jump, muscles contract and deform the resilin pad, slowly storing energy which can then be released extremely rapidly to power leg extension for propulsion.[7] To prevent premature release of energy or motions of the leg, the flea employs a "catch mechanism".[7] Early in the jump, the tendon of the primary jumping muscle passes slightly behind the coxa-trochanter joint, generating a torque which holds the joint closed with the leg close to the body.[7] To trigger jumping, another muscle pulls the tendon forward until it passes the joint axis, generating the opposite torque to extend the leg and power the jump by release of stored energy.[7] The actual take off has been shown by high-speed video to be from the tibiae and tarsi rather than from the trochantera (knees).[6]

Life cycle and development

A dog flea (Ctenocephalides canis); adult, pupa, egg and lar Wellcome V0022501EL
Dog flea (from top) larva, egg, pupa and adult

Fleas are holometabolous insects, going through the four lifecycle stages of egg, larva, pupa, and imago (adult). In most species, neither female nor male fleas are fully mature when they first emerge but must feed on blood before they become capable of reproduction.[3] The first blood meal triggers the maturation of the ovaries in females and the dissolution of the testicular plug in males, and copulation soon follows.[8] Some species breed all year round while others synchronise their activities with their hosts' life cycles or with local environmental factors and climatic conditions.[9] Flea populations consist of roughly 50% eggs, 35% larvae, 10% pupae, and 5% adults.[5]

Egg

The number of eggs laid depends on species, with batch sizes ranging from two to several dozen. The total number of eggs produced in a female's lifetime (fecundity) varies from around one hundred to several thousand. In some species, the flea lives in the nest or burrow and the eggs are deposited on the substrate,[8] but in others, the eggs are laid on the host itself and can easily fall off onto the ground. Because of this, areas where the host rests and sleeps become one of the primary habitats of eggs and developing larvae. The eggs take around two days to two weeks to hatch.[5] Experiments have shown that fleas lay more eggs on hosts which have limited food intakes, and that eggs and larvae survive better under these conditions, perhaps because the host's immune system is compromised.[10]

Larva

Flea Larva
Flea larva

Flea larvae emerge from the eggs to feed on any available organic material such as dead insects, faeces, conspecific eggs, and vegetable matter. In laboratory studies, some dietary diversity seems necessary for proper larval development. Blood-only diets allow only 12% of larvae to mature, whereas blood and yeast or dog chow diets allow almost all larvae to mature.[11] Another study also showed that 90% of larvae matured into adults when the diet included nonviable eggs.[12] They are blind and avoid sunlight, keeping to dark, humid places such as sand or soil, cracks and crevices, under carpets and in bedding.[13]

Pupa

Given an adequate supply of food, larvae pupate and weave silken cocoons after three larval stages. Within the cocoon, the larva molts for a final time and undergoes metamorphosis into the adult form. This can take just four days, but may take much longer under adverse conditions, and there follows a variable-length stage during which the pre-emergent adult awaits a suitable opportunity to emerge. Trigger factors for emergence include vibrations (including sound), heat (in warm-blooded hosts), and increased levels of carbon dioxide, all of which stimuli may indicate the presence of a suitable host.[5] Large numbers of pre-emergent fleas may be present in otherwise flea-free environments, and the introduction of a suitable host may trigger a mass emergence.[13]

Adult

Once the flea reaches adulthood, its primary goal is to find blood and then to reproduce.[14] Female fleas can lay 5000 or more eggs over their life, permitting rapid increase in numbers.[15] Generally speaking, an adult flea only lives for 2 or 3 months. Without a host to provide a blood meal, a flea's life can be as short as a few days. Under ideal conditions of temperature, food supply, and humidity, adult fleas can live for up to a year and a half.[15] Completely developed adult fleas can live for several months without eating, so long as they do not emerge from their puparia. Optimum temperatures for the flea's life cycle are 21 °C to 30 °C (70 °F to 85 °F) and optimum humidity is 70%.[16]

Adult female rabbit fleas, Spilopsyllus cuniculi, can detect the changing levels of cortisol and corticosterone hormones in the rabbit's blood that indicate it is getting close to giving birth. This triggers sexual maturity in the fleas and they start producing eggs. As soon as the baby rabbits are born, the fleas make their way down to them and once on board they start feeding, mating, and laying eggs. After 12 days, the adult fleas make their way back to the mother. They complete this mini-migration every time she gives birth.[16]

Taxonomy and phylogeny

Boreus hiemalis2 detail
The snow scorpionflies (Boreidae) are the sister clade to the Siphonaptera.

Between 1735 and 1758, the Swedish naturalist Carl Linnaeus first classified insects, doing so on the basis of their wing structure. One of the seven orders into which he divided them was "Aptera", meaning wingless, a group in which as well as fleas, he included spiders, woodlice and myriapods. It wasn't until 1810 that the French zoologist Pierre André Latreille reclassified the insects on the basis of their mouthparts as well as their wings, splitting Aptera into Thysanura (silverfish), Anoplura (sucking lice) and Siphonaptera (fleas), at the same time separating off the arachnids and crustaceans into their own subphyla.[17] The group's name, Siphonaptera, is zoological Latin from the Greek siphon (a tube) and aptera (wingless).[18]

Fleas are related to the Diptera (true flies) and the Mecoptera (scorpion flies) as shown in the cladogram, based on a 2008 analysis of four loci (18S and 28S ribosomal DNA, cytochrome oxidase II, and elongation factor 1-alpha) for 128 flea taxa from around the world. The Boreidae (snow scorpionflies) are the sister clade to the Siphonaptera.[19][20][21][22]

part of Endopterygota
Panorpida
Antliophora

Diptera Common house fly, Musca domestica

Mecoptera (scorpionflies, hangingflies, 400 spp.) (exc. Boreidae) Gunzesrieder Tal Insekt 3

Boreidae (snow scorpionflies, 30 spp.) Boreus hiemalis2 detail

Siphonaptera (fleas, 2500 spp.) Pulex irritans female ZSM

Amphies.

Trichoptera (caddisflies) Sericostoma.personatum

Lepidoptera (butterflies and moths) Tyria jacobaeae-lo.jpg

Hymenoptera (sawflies, wasps, ants, bees) AD2009Sep09 Vespula germanica 03

Amphies. = Amphiesmenoptera
Flea in amber
Cenozoic flea in amber, c. 20 mya, is morphologically modern.

Fossils of wingless "pre-fleas" with siphonate (sucking) mouthparts from the middle Jurassic[23] to early Cretaceous have been found in northeastern China. These belonged to three proposed extinct families, the Pseudopulicidae, the Saurophthiridae, and the Tarwiniidae. The last common ancestor of modern Siphonaptera separated from the Mecoptera during the early Cretaceous. Most flea families formed after the end of the Cretaceous (in the Paleogene and onwards). Fleas probably arose in the southern continental area of Gondwana, and migrated rapidly northwards from there. They most likely evolved with mammal hosts, only later moving to birds.[24]

Bicho-de-pé 1
Jigger, Tunga penetrans, in human skin

Siphonaptera is a relatively small order of insects: members of the order undergo complete metamorphosis and are secondarily wingless (their ancestors had wings which modern forms have lost). In 2005, Medvedev listed 2005 species in 242 genera, and despite subsequent descriptions of new species, bringing the total up to around 2500 species,[19] this is the most complete database available. The order is divided into four infraorders and eighteen families. Some families are exclusive to a single host group; these include the Malacopsyllidae (armadillos), Ischnopsyllidae (bats) and Chimaeropsyllidae (elephant shrews).[25]

Many of the known species are little studied. Some 600 species (a quarter of the total) are known from a single record from a single host. Over 94% of species are associated with mammalian hosts, and only about 3% of species can be considered to be specific parasites of birds. The fleas on birds are thought to have originated from mammalian fleas; at least sixteen separate groups of fleas switched to avian hosts during the evolutionary history of the Siphonaptera. Occurrences of fleas on reptiles is accidental, and fleas have been known to feed on the hemolymph (bloodlike body fluid) of ticks.[25]

Flea phylogeny was long neglected, the discovery of homologies with the parts of other insects being made difficult by their extreme specialization. Whiting and colleagues prepared a detailed molecular phylogeny in 2008, with the basic structure shown in the cladogram. The Tungidae, including the harmful chigoe flea or jigger, is sister to the rest of the Siphonaptera.[19]

Boreidae (snow scorpionflies)

Siphonaptera

Tungidae (inc. chigoe flea or jigger)

Pygiopsyllomorpha

Macropsyllidae, Coptopsyllidae

Neotyphloceratini, Ctenophthalmini, Doratopsyllinae

Stephanocircidae

clade inc. Rhopalopsyllidae, Ctenophthalmidae, Hystrichopsyllidae

Chimaeropsyllidae

Pulicidae (inc. the cat flea, vector of bubonic plague)

Ceratophyllomorpha (inc. the Ceratophyllidae, such as the widespread moorhen flea)

Relationship with host

Fleas feed on a wide variety of warm-blooded vertebrates including humans, dogs, cats, rabbits, squirrels, ferrets, rats, mice and birds. Fleas normally specialise in one host species or group of species, but can often feed but not reproduce on other species. Ceratophyllus gallinae affects poultry as well as wild birds.[26] As well as the degree of relatedness of a potential host to the flea's original host, it has been shown that avian fleas that exploit a range of hosts, only parasitise species with low immune responses. In general, host specificity decreases as the size of the host species decreases. Another factor is the opportunities available to the flea to change host species; this is smaller in colonially nesting birds, where the flea may never encounter another species, than it is in solitary nesting birds. A large, long-lived host provides a stable environment that favours host-specific parasites.[27]

One theory of human hairlessness is that the loss of hair helped humans to reduce their burden of fleas and other ectoparasites.[28]

Direct effects of bites

Jigger infested foot (2)
Human foot infested with jigger fleas, Tunga penetrans

In many species, fleas are principally a nuisance to their hosts, causing an itching sensation which in turn causes the host to try to remove the pest by biting, pecking or scratching. Fleas are not simply a source of annoyance, however. Flea bites cause a slightly raised, swollen itching spot to form; this has a single puncture point at the centre, like a mosquito bite.[29]:126 Besides this, the eczematous itchy skin disease flea allergy dermatitis is common in many host species, including dogs and cats.[26] The bites often appear in clusters or lines of two bites, and can remain itchy and inflamed for up to several weeks afterwards. Fleas can lead to hair loss as a result of frequent scratching and biting by the animal, and can cause anemia in extreme cases.[29]:126

As a vector

Fleas are vectors for viral, bacterial and rickettsial diseases of humans and other animals, as well as of protozoan and helminth parasites.[30] Bacterial diseases carried by fleas include murine or endemic typhus[29]:124 and bubonic plague.[31] Fleas can transmit Rickettsia typhi, Rickettsia felis, Bartonella henselae, and the myxomatosis virus.[30]:73 They can carry Hymenolepiasis tapeworms[32] and Trypanosome protozoans.[30]:74 The chigoe flea or jigger (Tunga penetrans) causes the disease tungiasis, a major public health problem around the world.[33] Fleas that specialize as parasites on specific mammals may use other mammals as hosts; thus, humans may be bitten by cat and dog fleas.[34]

Relationship with humans

In literature and art

HookeFlea01
Robert Hooke's drawing of a flea in Micrographia, 1665

Fleas have appeared in poetry, literature, music and art; these include Robert Hooke's drawing of a flea under the microscope in his pioneering book Micrographia published in 1665,[35] poems by Donne and Jonathan Swift, works of music by Giorgio Federico Ghedini and Modest Mussorgsky, a play by Georges Feydeau, a film by Charlie Chaplin, and paintings by artists such as Giuseppe Crespi, Giovanni Battista Piazzetta, and Georges de La Tour.[36]

The development of the flea from egg to adult Wellcome M0016633
Development of the flea from egg to adult. Antonie van Leeuwenhoek, c. 1680

John Donne's erotic metaphysical poem "The Flea", published in 1633 after his death, uses the conceit of a flea, which has sucked blood from the male speaker and his female lover, as an extended metaphor for their sexual relationship. The speaker tries to convince a lady to sleep with him, arguing that if the mingling of their blood in the flea is innocent, then sex would be also.[37]

Flea circuses

The Go-As-You-Please Race, as seen through a Magnifying Glass
A flea circus: "The Go-As-You-Please Race, as seen through a Magnifying Glass", engraved by J. G. Francis, from an article by C. F. Holder in St. Nicholas Magazine, 1886

Flea circuses provided entertainment to nineteenth century audiences. These circuses, extremely popular in Europe from 1830 onwards, featured fleas dressed as humans or towing miniature carts, chariots, rollers or cannon. These devices were originally made by watchmakers or jewellers to show off their skill at miniaturization. A ringmaster called a "professor" accompanied their performance with a rapid circus patter.[38][39]

Carriers of plague

Great plague of london-1665
The Great Plague of London, in 1665, killed up to 100,000 people.

Oriental rat fleas, Xenopsylla cheopis, can carry the coccobacillus Yersinia pestis. The infected fleas feed on rodent vectors of this bacterium, such as the black rat, Rattus rattus, and then infect human populations with the plague, as has happened repeatedly from ancient times, as in the Plague of Justinian in 541–542.[40] Outbreaks killed up to 200 million people across Europe between 1346 and 1671.[41] The Black Death pandemic between 1346 and 1353 likely killed over a third of the population of Europe.[42]

Because fleas carry plague, they have seen service as a biological weapon. During World War II, the Japanese army dropped fleas infested with Y. pestis in China. The bubonic and septicaemic plagues are the most probable form of the plague that would spread as a result of a bioterrorism attack that used fleas as a vector.[43]

The Rothschild Collection

The banker Charles Rothschild devoted much of his time to entomology, creating a large collection of fleas now in the Rothschild Collection at the Natural History Museum, London. He discovered and named the plague vector flea, Xenopsylla cheopis, also known as the oriental rat flea, in 1903.[44] Using what was probably the world's most complete collection of fleas of about 260,000 specimens (representing some 73% of the 2,587 species and subspecies so far described), he described around 500 species and subspecies of Siphonaptera. He was followed in this interest by his daughter Miriam Rothschild, who helped to catalogue his enormous collection of the insects in seven volumes.[45][46]

Flea treatments

Fleas have a significant economic impact. In America alone, approximately $2.8 billion is spent annually on flea-related veterinary bills and another $1.6 billion annually for flea treatment with pet groomers. Four billion dollars is spent annually for prescription flea treatment and $348 million for flea pest control.[13]

See also

References

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  22. ^ Wiegmann, Brian; Yeates, David K. (2012). The Evolutionary Biology of Flies. Columbia University Press. p. 5. ISBN 978-0-231-50170-5. Recently, a close affinity between Siphonaptera and Mecoptera has been convincingly demonstrated via morphology (Bilinski et al. 1998) and molecular data (Whiting 2002), rendering Mecoptera paraphyletic, but making the clade including Mecoptera and Siphonaptera monophyletic ... there is a general consensus among entomologists that the relationships described above are relatively well established.
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  35. ^ Neri, Janice (2008). "Between Observation and Image: Representations of Insects in Robert Hooke's Micrographia". In O'Malley, Therese; Meyers, Amy R. W. (eds.). The Art of Natural History. National Gallery of Art. pp. 83–107. ISBN 978-0-300-16024-6.
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External links

3,4-Methylenedioxy-N-hydroxy-N-methylamphetamine

3,4-Methylenedioxy-N-hydroxy-N-methylamphetamine (MDHMA; FLEA) is an entactogen, psychedelic, and stimulant of the phenethylamine and amphetamine chemical classes. It is the N-hydroxy homologue of MDMA ("Ecstasy"), and the N-methyl homologue of MDOH. MDHMA was first synthesized and assayed by Alexander Shulgin. In his book PiHKAL (Phenethylamines i Have Known And Loved), Shulgin listed the dosage range as 100–160 mg, and the duration as approximately 4–8 hours. He describes MDHMA as causing entactogenic and open MDMA-like effects, easing communication, and increasing appreciation of the senses.

Bubonic plague

Bubonic plague is one of three types of plague caused by bacterium Yersinia pestis. One to seven days after exposure to the bacteria, flu-like symptoms develop. These symptoms include fever, headaches, and vomiting. Swollen and painful lymph nodes occur in the area closest to where the bacteria entered the skin. Occasionally, the swollen lymph nodes may break open.The three types of plague are the result of the route of infection: bubonic plague, septicemic plague, and pneumonic plague. Bubonic plague is mainly spread by infected fleas from small animals. It may also result from exposure to the body fluids from a dead plague-infected animal. In the bubonic form of plague, the bacteria enter through the skin through a flea bite and travel via the lymphatic vessels to a lymph node, causing it to swell. Diagnosis is made by finding the bacteria in the blood, sputum, or fluid from lymph nodes.Prevention is through public health measures such as not handling dead animals in areas where plague is common. Vaccines have not been found to be very useful for plague prevention. Several antibiotics are effective for treatment, including streptomycin, gentamicin, and doxycycline. Without treatment, plague results in the death of 30% to 90% of those infected. Death, if it occurs, is typically within ten days. With treatment the risk of death is around 10%. Globally there are about 650 documented cases a year, which result in ~120 deaths. In the 21st century, the disease is most common in Africa.The plague is believed to be the cause of the Black Death that swept through Asia, Europe, and Africa in the 14th century and killed an estimated 50 million people. This was about 25% to 60% of the European population. Because the plague killed so many of the working population, wages rose due to the demand for labor. Some historians see this as a turning point in European economic development. The disease was also responsible for the Justinian plague originating in the Eastern Roman Empire in the 6th century CE, as well as the third epidemic affecting China, Mongolia, and India originating in the Yunnan Province in 1855. The term bubonic is derived from the Greek word βουβών, meaning "groin". The term "buboes" is also used to refer to the swollen lymph nodes.

Cat flea

The cat flea (scientific name Ctenocephalides felis) is an extremely common parasitic insect whose principal host is the domestic cat, although a high proportion of the fleas found on dogs also belong to this species. This is despite the widespread existence of a separate and well-established "dog" flea, Ctenocephalides canis.

Characters of Chrono Trigger

This is a listing of notable characters from the video game Chrono Trigger, a role-playing video game released in 1995 by Square Co. (now Square Enix) for the Super Nintendo Entertainment System video game console. In keeping with the time travel theme of the game's storyline, the characters hail from different eras of a fictional history, ranging from prehistoric times to a post-apocalyptic future.

Cladocera

The Cladocera are an order of small crustaceans commonly called water fleas. Over 650 species have been recognised so far, with many more undescribed. They first appeared in the Oligocene period, and have since invaded most freshwater habitats. Some have also adapted to a life in the ocean, the only members of Branchiopoda to do so, even if several anostracans live in hypersaline lakes. Most are 0.2–6.0 mm (0.01–0.24 in) long, with a down-turned head with a single median compound eye, and a carapace covering the apparently unsegmented thorax and abdomen. Most species show cyclical parthenogenesis, where asexual reproduction is occasionally supplemented by sexual reproduction, which produces resting eggs that allow the species to survive harsh conditions and disperse to distant habitats.

Comb

A comb is a tool consisting of a shaft that holds a row of teeth for pulling through the hair to clean, untangle, or style it. Combs have been used since prehistoric times, having been discovered in very refined forms from settlements dating back to 5,000 years ago in Africa.

Flea-borne spotted fever

Flea-borne spotted fever is a condition characterized by a rash of maculopapules or furuncles.It is caused by Rickettsia felis.

Flea (musician)

Michael Peter Balzary (born 16 October 1962), known professionally as Flea, is an Australian-American musician and actor. He is best known as the bassist of the rock band Red Hot Chili Peppers and, due to bandmate Anthony Kiedis' brief absence in 1986, is the only constant founding member of the group. Flea is widely considered among the best bassists of all time.

Flea briefly appeared as the bassist for such bands as What Is This?, Fear, and Jane's Addiction. He has performed with rock supergroups Atoms for Peace, Antemasque, Pigface, and Rocket Juice & the Moon, and collaborated with The Mars Volta, Johnny Cash, Tom Waits, Alanis Morissette, and Young MC. Flea also performed live with Nirvana in 1993 playing the trumpet.

Flea incorporates elements of funk (including slap bass), psychedelic, punk, and hard rock. In 2009, Rolling Stone readers ranked Flea the second best bassist of all time, behind only John Entwistle. In 2012, he and the other members of Red Hot Chili Peppers were inducted into the Rock and Roll Hall of Fame.Since 1984, Flea has acted in over 20 films and television series such as Suburbia, Back to the Future Part II and Part III, My Own Private Idaho, The Chase, Fear and Loathing in Las Vegas, Dudes, Son in Law, The Big Lebowski, Low Down, Baby Driver and Boy Erased, in addition to voicing the character Donnie Thornberry in The Wild Thornberrys animated television series and films.

Flea is also the co-founder of Silverlake Conservatory of Music, a non-profit music education organization founded in 2001 for underprivileged children. In 2019 Flea will release his memoir Acid for the Children which will detail his life prior to the formation of Red Hot Chili Peppers.

Flea Kicker

In college football, the Flea Kicker was a notable play executed by the Nebraska Cornhuskers against the Missouri Tigers on November 8, 1997 that sent the game into overtime and resulted in a win for the Cornhuskers who went on to share the NCAA Division I-A National Championship with the Michigan Wolverines. The final minutes of the game were seen by many people on ABC, after other regional games ended.

Flea Market Cup

The Flea Market Cup is a professional tennis tournament played on outdoor hard courts. It is part of the Association of Tennis Professionals (ATP) Challenger Tour. The tournament, which started in 2005, was held in Busan, South Korea during 2003-08, and the location has been moved to Chuncheon in 2009.

Flea Valley, California

Flea Valley (also, Flea Valley House) is a former settlement and mining camp in Butte County, California. It was located northeast of Magalia, at an elevation of 3684 feet (1123 m). Flea Valley still appeared on USGS maps as of 1897.Flea Valley has been noted for its unusual place name.

Flea beetle

The flea beetle is a small, jumping beetle of the leaf beetle family (Chrysomelidae), that makes up the tribe Alticini which is a part of the subfamily Galerucinae. Historically the flea beetles were classified as their own subfamily.

Though most tribes of the Galerucinae are suspect of rampant paraphyly in the present delimitation, the Alticini seem to form a good clade.

Flea circus

A flea circus is a circus sideshow attraction in which fleas are attached (or appear to be attached) to miniature carts and other items, and encouraged to perform circus acts within a small housing.

Flea market

A flea market (or swap meet) is a type of street market which provides space for vendors to sell previously-owned merchandise. This type of market is often seasonal, however in recent years there has been the development of 'formal' and 'casual' markets which divides a fixed-style market (formal) with long-term leases and a seasonal-style market with short-term leases. Consistently, there tends to be an emphasis on sustainable consumption whereby items such as used goods, collectibles, antiques and vintage clothing can be purchased.Flea market vending is distinguished from street vending in that the market itself, and not any other public attraction, brings in buyers. There is a variety of vendors; some part-time who consider their work at flea markets a form of hobby due to their possession of an alternative job, full-time vendors who dedicate all their time to their stalls and collection of merchandise and rely solely from the profits made at the market. Vendors require skill in following retro and vintage trends as well as selecting merchandise which connects with the culture and identity of their customers.

Insecticide

Insecticides are substances used to kill insects. They include ovicides and larvicides used against insect eggs and larvae, respectively. Insecticides are used in agriculture, medicine, industry and by consumers. Insecticides are claimed to be a major factor behind the increase in the 20th-century's agricultural productivity. Nearly all insecticides have the potential to significantly alter ecosystems; many are toxic to humans and/or animals; some become concentrated as they spread along the food chain.

Insecticides can be classified into two major groups: systemic insecticides, which have residual or long term activity; and contact insecticides, which have no residual activity.

Furthermore, one can distinguish three types of insecticide. 1. Natural insecticides, such as nicotine, pyrethrum and neem extracts, made by plants as defenses against insects. 2. Inorganic insecticides, which are metals. 3. Organic insecticides, which are organic chemical compounds, mostly working by contact.

The mode of action describes how the pesticide kills or inactivates a pest. It provides another way of classifying insecticides. Mode of action is important in understanding whether an insecticide will be toxic to unrelated species, such as fish, birds and mammals.

Insecticides may be repellent or non-repellent. Social insects such as ants cannot detect non-repellents and readily crawl through them. As they return to the nest they take insecticide with them and transfer it to their nestmates. Over time, this eliminates all of the ants including the queen. This is slower than some other methods, but usually completely eradicates the ant colony.Insecticides are distinct from non-insecticidal repellents, which repel but do not kill.

Plague (disease)

Plague is an infectious disease caused by the bacterium Yersinia pestis. Symptoms include fever, weakness and headache. Usually this begins one to seven days after exposure. In the bubonic form there is also swelling of lymph nodes, while in the septicemic form tissues may turn black and die, and in the pneumonic form shortness of breath, cough and chest pain may occur.Bubonic and septicemic plague is generally spread by flea bites or handling an infected animal. The pneumonitic form is generally spread between people through the air via infectious droplets. Diagnosis is typically by finding the bacterium in fluid from a lymph node, blood or sputum.Those at high risk may be vaccinated. Those exposed to a case of pneumonic plague may be treated with preventative medication. If infected, treatment is with antibiotics and supportive care. Typically antibiotics include a combination of gentamicin and a fluoroquinolone. The risk of death with treatment is about 10% while without it is about 70%.Globally about 600 cases are reported a year. In 2017 the countries with the most cases include the Democratic Republic of the Congo, Madagascar and Peru. In the United States infections occasionally occur in rural areas and the bacteria is believed to circulate among rodents. It has historically occurred in large outbreaks, with the best known being the Black Death in the 14th century, which resulted in greater than 50 million deaths.

Red Hot Chili Peppers

Red Hot Chili Peppers are an American rock band formed in Los Angeles in 1983. The group's musical style primarily consists of rock with an emphasis on funk, as well as elements from other genres such as punk rock and psychedelic rock. When played live, their music incorporates elements of jam band due to the improvised nature of many of their performances. Currently, the band consists of founding members vocalist Anthony Kiedis and bassist Flea (Michael Peter Balzary), longtime drummer Chad Smith, and former touring guitarist Josh Klinghoffer. Red Hot Chili Peppers are one of the best-selling bands of all time with over 80 million records sold worldwide, they have been nominated for sixteen Grammy Awards, of which they have won six, and are the most successful band in alternative rock radio history, currently holding the records for most number-one singles (13), most cumulative weeks at number one (85) and most top-ten songs (25) on the Billboard Alternative Songs chart. In 2012, they were inducted into the Rock and Roll Hall of Fame.

The band's original lineup, originally named Tony Flow and the Miraculously Majestic Masters of Mayhem, featured guitarist Hillel Slovak and drummer Jack Irons, alongside Kiedis and Flea. Because of commitments to other bands, Slovak and Irons did not play on the band's 1984 self-titled debut album. Slovak performed on the second and third albums, Freaky Styley (1985) and The Uplift Mofo Party Plan (1987), but he died from a heroin overdose in 1988. As a result of his friend's death, Irons chose to leave the group. After short-lived replacements on guitar and drums, John Frusciante and Smith joined in 1988. The lineup of Flea, Kiedis, Frusciante, and Smith was the longest-lasting and recorded five studio albums beginning with Mother's Milk (1989). In 1990, the group signed with Warner Bros. Records and recorded the album Blood Sugar Sex Magik (1991) under producer Rick Rubin. This album became the band's first major commercial success, but Frusciante grew uncomfortable with the band's popularity and left abruptly in 1992 in the middle of the Blood Sugar Sex Magik Tour.

After two temporary guitarists, Dave Navarro joined the group in 1993 and played on their subsequent album, One Hot Minute (1995). Although commercially successful, the album failed to match the critical or popular acclaim of Blood Sugar Sex Magik, selling less than half as much as its predecessor. Navarro was fired from the band in 1998. Frusciante, fresh out of drug rehabilitation, rejoined the band that same year at Flea's request. The reunited quartet returned to the studio to record Californication (1999), which became the band's biggest commercial success with 16 million copies sold worldwide. That album was followed three years later by By the Way (2002), and then four years later by the double album Stadium Arcadium (2006), their first number-one album in America. After a world tour, the group went on an extended hiatus. Frusciante announced he was amicably leaving the band in 2009 to focus on his solo career. Klinghoffer, who had worked both as a sideman for the band on their Stadium Arcadium tour and on Frusciante's solo projects, replaced him. The band's tenth studio album, I'm with You, was released in 2011 and topped the charts in 18 different countries. The band released their eleventh studio album, The Getaway, in 2016. The album was produced by Danger Mouse, marking the first time since Mother's Milk that the Red Hot Chili Peppers had not worked with Rubin, and topped the charts in ten different countries. As of November 2018, the band is in the process of working on their twelfth studio album which they expect to release in 2019.

Saint-Ouen-sur-Seine

Saint-Ouen-sur-Seine (French pronunciation: ​[sɛ̃t‿wɛ̃ syʁ sɛn]) is a commune in the Seine-Saint-Denis department in the Île-de-France region of France. It is located in the northern suburbs of Paris, 6.6 kilometres (4.1 miles) from the centre of Paris. The commune was officially called Saint-Ouen until 2018, when its name was changed by ministerial order.The communes neighbouring Saint-Ouen-sur-Seine are Paris, to the south, Clichy, to the west, Asnières-sur-Seine and L'Île-Saint-Denis, to the north, and Saint-Denis to the east. The commune of Saint-Ouen-sur-Seine is part of the canton of Saint-Ouen, which also includes L'Île-Saint-Denis and part of Épinay-sur-Seine. Saint-Ouen also includes the Cimetière de Saint-Ouen.

The Red Hot Chili Peppers (album)

The Red Hot Chili Peppers is the debut studio album by American rock band Red Hot Chili Peppers, released on August 10, 1984 on EMI America and Enigma Records. The album was produced by Gang of Four guitarist Andy Gill, and is the only album to feature Jack Sherman on guitar. Sherman was in the band as a replacement for founding member Hillel Slovak, who had left the band along with founding drummer Jack Irons before the album was recorded. Shortly after the album was released, Sherman was fired and Slovak rejoined the band. The album also features founding members Anthony Kiedis on vocals and Flea on bass, as well as Cliff Martinez on drums.

"Get Up and Jump" was the only single released from the album, but a music video was made for the song "True Men Don't Kill Coyotes".

It has been credited as the first release from the funk metal genre and has also been labelled as "the little spark that ignited the rap rock revolution."

Flea-borne diseases
Bacterial infection
(all G-)
Viral infection
Protozoan infection
Helminth
Vectors
Insect orders
Extant Mecoptera and Siphonaptera families
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