A family vacation in Belize in December 2008....... Nightmare for one family member..............
Two weeks after returning from an otherwise wonderful vacation, he begins to develop a 102 degree fever which lasts for two weeks. He experiences random bleeding from three small, infected wounds on his left elbow. He sees four different internists and after two rounds of antibiotics is still suffering from the symptoms. It turns out that he had three bot fly larvae growing in his arm. This video shows the removal of the larvae.
Bot flies (Order Diptera, Family Cuterebridae) are large, stout bodied, hairy flies that resemble bumblebees. The botfly egg is deposited by a mosquito or sometimes by another insect. The larva grows in the host's body until it is fairly large. The botfly larva can easily be killed by taking away its air supply -- by putting vaseline or similar on the skin where the lump is, but then you still have to extract the larva. Adult botflies have nonfunctional mouthparts and do not feed. Larvae of this species parasitize wild and domestic rabbits.
Females deposit their eggs in or near the entrance of their host's burrow. Bot fly larvae penetrate their host through the skin or natural body openings after hatching. The larvae form a tumor (called a warble) in the subdermal zones of their host and remain at this location until larval development is complete. Larval development varies among species, ranging from 20 to 60 days. Before pupating, the larvae leave the host's skin and drop to the soil.
____________
The human botfly, Dermatobia hominis, (Greek δέρμα, skin + βίος, life, and Latin hominis, of a human) is one of several species of fly the larvae of which 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] even 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 approximately eight weeks, they drop out to pupate for at least a week, typically in the soil. The adults are small gray flies resembling a blowfly.
This species is native to the Americas from Mexico to northern Argentina and Chile,[1] though it is not abundant enough (nor harmful enough) ever to attain true pest status. Since the fly larvae can survive the entire eight-week development only if the wound does not become infected, it is rare for patients to experience infections unless they kill the larva without removing it completely. It is even possible that the fly larva may itself produce antibiotic secretions that help prevent infection while it is feeding.
