Dermatobia hominis

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Dermatobia hominis
Adult female human botfly
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Oestridae
Subfamily: Cuterebrinae
Genus: Dermatobia
Species:
D. hominis
Binomial name
Dermatobia hominis
(
Linnaeus Jr. in Pallas
, 1781)
Synonyms

Oestrus hominis (

Linnaeus Jr. in Pallas
, 1781)

The human botfly, Dermatobia hominis (

parasitise humans (in addition to a wide range of other animals, including other primates[1]). It is also known as the torsalo or American warble fly,[1] though the warble fly is in the genus Hypoderma and not Dermatobia, and is a parasite on cattle
and deer instead of humans.

Dermatobia fly eggs have been shown to be

vectored by over 40 species of mosquitoes and muscoid flies, as well as one species of tick;[2] the female captures the mosquito and attaches its eggs to its body, then releases it. Either the eggs hatch while the mosquito is feeding and the larvae use the mosquito bite area as the entry point, or the eggs simply drop off the muscoid fly when it lands on the skin. The larvae develop inside the subcutaneous layers, and after about eight weeks, they drop out to pupate for at least a week, typically in the soil. The adults are large flies lacking mouthparts (as is true of other oestrid flies
).

This species is native to the Americas from southeastern Mexico (beginning in central Veracruz) to northern Argentina, Chile, and Uruguay,[1] though it is not abundant enough (nor harmful enough) to ever attain true pest status. Normally the greatest risk they pose to humans is increasing the chances of infection. Since the fly larvae can survive the entire eight-week development only if the wound does not become infected, patients rarely experience infections unless they kill the larva without removing it completely.

Extracted human botfly larva: The arrow points to the larva's mouthparts.

Remedies

The easiest and most effective way to remove botfly larvae is to apply petroleum jelly over the location, which prevents air from reaching the larva, suffocating it. It can then be removed with tweezers safely after a day. White glue mixed with pyrethrin or other safe insecticides and applied to the spot of swelling on the scalp will kill the larvae within hours, as they must keep an air hole open, so will chew through the dried glue to do this, consuming the insecticide in the process.[citation needed]

breathing tube is fragile and would be broken during the removal of the tape, leaving most of the larva behind.[4]

Oral use of ivermectin, an antiparasitic avermectin medicine, has proven to be an effective and noninvasive treatment that leads to the spontaneous emigration of the larva.[5] This is especially important for cases where the larva is located in inaccessible places such as inside the inner canthus of the eye.

Map of human botfly region

See also

References

  1. ^ a b c "Human Bot Fly Myiasis" (PDF). U.S. Army Public Health Command (provisional), formerly U.S. Army Center for Health Promotion and Preventive Medicine. January 2010. Retrieved 2014-08-14.
  2. OCLC 191846476
    . Retrieved 2009-02-13.
  3. PMID 12115102
    .
  4. ^
    PMID 17360891
    .
  5. PMID 16244643
    .

External links
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