Non blood sucking flies play a fantastic position in mechanical transmission of bacterial, viral, protozoan and helminthic illnesses. A very good instance of such organisms is the Household Muscidae which incorporates three flies of medical significance (Musca, stomoxys and Glossina)
Musca domestica
Housefly is a medium-sized fly, measuring between 6 and 10mm in size; the feminine is mostly barely bigger than the male. Grownup fly has a grey coloration. Its physique is split into head, thorax, and stomach. Eggs are laid into plenty of decaying natural substances, rubbish, refuse or manure. Larvae hatch in 6-24 hours and feed on natural matter. They molt 2 occasions giving 3 larval phases. The third larva pupates contained in the larval pores and skin. The grownup emerges after a number of days by a round reduce of the puparium. The entire cycle takes about one week.
Medical Significance
Oblique mechanical transmission of microorganisms (as typhoid, poliomyelitis and bacillary dysentery), eggs of helminthes and cyst of protozoa. Unintended myasis. It’s managed by sanitary disposal of refuses, rubbish and manure (breeding media) by dumping, burning or software of pesticides. Additionally by management of grownup flies by screening or area spraying or pesticides. Myiasis is invasion of tissues of animals or man by larvae of dipterous fly.
Classification of myiasis
1. In keeping with the habits of the flies:
. particular myiasis- On this case flies are compulsory tissue parasites; larvae develop solely in residing tissues (compulsory sarcobiots). The place of flies’ oviposition is positioned in or close to residing tissues. Examples, 1.) Members of household Oestridae: Oestrus, Hypoderma, Dermatobia. 2.) Gasterophitus 3.) Cordilobia (lay eggs on floor or clothes, larvae don’t penetrate unbroken pores and skin, solely wounded or diseased tissues).
. Semi-specific myiasis. On this case flies are compulsory necrobiots; they lay eggs or larvae on decaying matter however could assault tissues (facultative sarcobiots) attracted by particular emanating odor from discharges of diseased tissues or wounds, e.g members of household Calliphoridea.
. Unintended myiasis (larvae could by accident get within the tissues, e.g Musca, stomoxis and Fannia).
2. In keeping with habitat (sort of invaded tissue):
. intestinal e.g Musca, Calliphora, Lucilia and Sarcophaga.
. gastric eg. Eristalis
. Urogenital eg. Fannia (lays eggs on urethral opening)
. cutaneous: Traumatic (wound) myiasis invade wounds or ulcers eg, members of household Calliphoridae; Creeping eruption eg Hypoderma and Nodular eg Dermatobia
. Ocular eg Oestrus, Wohlfahrtia and Sarcophaga
. aural eg, Wohlfahrtia and Sarcophaga
. nasopharyngeal eg Wohlfahrtia and Sarcophaga.
Prognosis relies on discovering of larvae within the lesion. Larvae are recognized by the attribute posterior sporacles. Residing larvae could also be reared to grownup stage for identification.
Therapy is by the removing of larvae.
