Warble fly: Difference between revisions
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'''Warble fly''' is a name given to the genus '''''Hypoderma''''', large [[fly|flies]] which are [[parasitism|parasitic]] on [[cattle]] and [[deer]]. Other names include "heel flies", "bomb flies", and "gad flies", while their larvae are often called "cattle grubs" or "wolves." Common species of warble fly include ''[[Hypoderma bovis]]'' and ''[[Hypoderma lineatum]]'' ([[cattle]]) and ''[[Hypoderma tarandi]]'' ([[reindeer]]). Larvae of ''Hypoderma'' species also have been reported in [[horse]]s, [[sheep]], [[goat]]s, and [[human]]s.<ref>''[http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/71402.htm The Merck Veterinary Manual.]''</ref> They have also been found on smaller [[mammal]]s such as [[cat]]s, [[squirrel]]s, [[rabbit]]s, and [[dog]]s. |
'''Warble fly''' is a name given to the genus '''''Hypoderma''''', large [[fly|flies]] which are [[parasitism|parasitic]] on [[cattle]] and [[deer]]. Other names include "heel flies", "bomb flies", and "gad flies", while their larvae are often called "cattle grubs" or "wolves." Common species of warble fly include ''[[Hypoderma bovis]]'' and ''[[Hypoderma lineatum]]'' ([[cattle]]) and ''[[Hypoderma tarandi]]'' ([[reindeer]]). Larvae of ''Hypoderma'' species also have been reported in [[horse]]s, [[sheep]], [[goat]]s, and [[human]]s.<ref>''[http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/71402.htm The Merck Veterinary Manual.]''</ref> They have also been found on smaller [[mammal]]s such as [[cat]]s, [[squirrel]]s, [[rabbit]]s,[(Vole)]s, and [[dog]]s. |
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Revision as of 21:54, 25 October 2014
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| Ox Warble-fly (Hypoderma bovis) | |
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| Genus: | Hypoderma Latreille, 1818
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Warble fly is a name given to the genus Hypoderma, large flies which are parasitic on cattle and deer. Other names include "heel flies", "bomb flies", and "gad flies", while their larvae are often called "cattle grubs" or "wolves." Common species of warble fly include Hypoderma bovis and Hypoderma lineatum (cattle) and Hypoderma tarandi (reindeer). Larvae of Hypoderma species also have been reported in horses, sheep, goats, and humans.[1] They have also been found on smaller mammals such as cats, squirrels, rabbits,[(Vole)]s, and dogs.
Adult warble flies are large, hairy, and bee-like and brown, orange, or yellow in color. The adults have vestigial mouthparts, so do not feed during their short lifespans, which can be as little as five days.[2]
They are found on all continents of the Northern Hemisphere, principally between 25 and 60° latitude.
Infestations
The fly lays eggs on the forelegs of large animals. They are ingested when the animal licks them off. The larvae travel to the skin surface and cause swellings called "warbles". They remain under the skin, and when destroyed by pressure, the larvae can cause large purulent swellings or anaphylaxis. Upon emergence, the fly leaves holes in the skin. Large numbers of such punctures can render cattle hides valueless.
The migrating larvae can cause damage to meat, as the tunnels they make in the muscle fill with a substance known as "butcher's jelly".[2] Infestations also hinder weight gain and growth in the animals. Milk yields may also decline. Most infections in adult cows are minor due to immunity developed over time.
Humans
In humans, the disease intracerebral myiasis is a rare infestation of the brain by the larva of H. bovis. It penetrates the brain by an unknown mode and causes symptoms such as convulsions and intracerebral hematoma. Only three cases appear in medical literature.[3] Myiasis of the human eye can be caused by H. tarandi, a parasite of caribou. It is known to cause uveitis, glaucoma, and retinal detachment.[4] H. lineatum and H. sinense may also infest humans.[4]
Treatment and prevention
Warble fly has been eradicated in many countries, beginning from Denmark and Western Germany, in the 1960s. It has not been eradicated in the United Kingdom,[5] and is still found in the wild deer population. It is a notifiable disease. It may have been eradicated from Belgium but not from Ireland.
From the 1980s, the preventive treatment is easier, by subcutaneous use of ivermectin, but the warble fly remains present in North Africa.
Rolls-Royce
In 1969, Mulliner Park Ward, a firm specialising in building car bodies for Rolls-Royce, reported that 40% of the (on average) seven hides per car needed to make leather car seats had to be thrown away on account of blemishes caused by warble flies and barbed wire while the cattle involved were still alive.[6]
See also
References
- ^ The Merck Veterinary Manual.
- ^ a b Piper, R. (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals. Greenwood Press.
- ^ Kalelioğlu, M.; et al. (December 1989). "Intracerebral myiasis from Hypoderma bovis larva in a child. Case report". J. Neurosurg. 71 (6): 929–931. doi:10.3171/jns.1989.71.6.0929. PMID 2585086.
{{cite journal}}: Explicit use of et al. in:|author=(help) - ^ a b Lagacé-Wiens, P. R., et al. (2008). Human ophthalmomyiasis interna caused by Hypoderma tarandi, Northern Canada. Emerging Infectious Diseases 14(1), 64.
- ^ http://archive.defra.gov.uk/foodfarm/farmanimal/diseases/atoz/warblefly/index.htm.
{{cite web}}: Missing or empty|title=(help) - ^ "Blame the warble flies". Motor: page 67. 1 March 1969.
{{cite journal}}:|pages=has extra text (help)
External links
- common cattle grub on the UF / IFAS Featured Creatures Web site