Dermatobia
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Transcript of Dermatobia
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DermatobiaSubmitted To:Dr.ShoaibSubmitted By:14- Arid-2022FAISAL SHAHZAD SOMROOPMAS
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Outline
• Introduction• What is Myiasis?• Classification• Host• The Human Bot Fly• Prevention/Treatment
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What is Myiasis?• The Infestation of animal tissue with Dipteran larvae.• For example. Maggots Occurs predominantly in the tropics
and subtropics of Africa and the Americas.
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Dermatobia hominis:The Human Bot Fly
Classification • Kingdom-Animalia• Phylum- Arthropoda• Class- Insecta• Order- Diptera• Family- Oestridae• Genus- Dermatobia• Species- D. hominis
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Host
Mammals• like cattle• Bovine• Humen
Canine• like cats• Dogs
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The Human Bot Fly Life-cycle• The Human Bot Fly Life-cycle• Females “glue” their eggs onto the body of an arthropod
(usually a fly or mosquito)• Eggs drop off the mosquito (or fly) during a blood meal.• Eggs hatch in response to heat and larvae burrow into the
epidermis.• Larvae then undergo 3 distinct developmental stages (instars)
within the host.
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Three Larval Instars of D.hominis• The first instar is subcylindrical with concentric rows of small
backward facing spines encasing the larval body.• The second instar has a pyriform (tapered) shape with 6
posterior spiracles.• The third instar is the form that emerges from the lesion and is
a fusiform shape (2cm).
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cont…• Third instar larvae emerges falls to the ground and pupates in
the soil.• Pupae develops further into mature, adult Bot Fly.
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Vectors for D. hominis• Mosquitoes and other flies that require a blood meal are all
possible vectors for The Human Bot Fly's eggs.
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Vectors Cont.
PHORESIS.• Method of depositing eggs on a different insect for dispersal/
transmission is known as PHORESIS.
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Prevention/Treatment• The most conventional way of removing the larvae is with a
simple surgical procedure that includes local anesthesia. Using a scalpel to cut a slit to enlarge the wound, the larvae can be taken out.
• In order to coax the larva out, the spiracles need to be covered.
• They can be covered with bacon, petroleum jelly, beeswax, or any other thick substance that prevents the larvae from breathing.
• The larvae will come up out of the lesion to breathe allowing it to be removed with forceps.
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Cont…• In some cases the larva maybe popped out by applying
pressure around the wound. • two wooden spatulas to apply pressure to pop the larva out.
• Use of lidocaine injections underneath the cyst. This creates pressure that pushes the larva out.
• After any of these procedures, antibiotics are given to prevent infection.
• The wound should heal in one to two weeks with little or no scarring.
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Literature Cited• Aguilera A; Cid A; Reguerio B; Prieto J; Noya M. Intestinal
myiasis aused by Eristalis• tenax. J Clin Microbiol. 1999 Sep; 37(9):3082.• Bapat, Sonali. Neonatal myiasis. Pediatrics. 2000 Jul;
106(1):e6.