DermatobiaSubmitted To:Dr.ShoaibSubmitted By:14- Arid-2022FAISAL SHAHZAD SOMROOPMAS

Outline

• Introduction• What is Myiasis?• Classification• Host• The Human Bot Fly• Prevention/Treatment

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.

Dermatobia hominis:The Human Bot Fly

Classification • Kingdom-Animalia• Phylum- Arthropoda• Class- Insecta• Order- Diptera• Family- Oestridae• Genus- Dermatobia• Species- D. hominis

Host

Mammals• like cattle• Bovine• Humen

Canine• like cats• Dogs

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.

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).

cont…• Third instar larvae emerges falls to the ground and pupates in

the soil.• Pupae develops further into mature, adult Bot Fly.

Vectors for D. hominis• Mosquitoes and other flies that require a blood meal are all

possible vectors for The Human Bot Fly's eggs.

Vectors Cont.

PHORESIS.• Method of depositing eggs on a different insect for dispersal/

transmission is known as PHORESIS.

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.

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.

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.