SKIN ECTOPARASITES
INSECTA Order: Diptera
| Calliphoridae: Auchmeromyia spp., Calliphora spp.,
Callitroga spp., Chrysomyia spp., Cordylobia spp., Lucilia spp., Phormia spp. |
| Cuterebridae: Dermatobia spp. |
| Gasterophillidae: Gasterophilus spp. |
| Oestridae: Hypoderma spp., Oestrus spp. |
| Sarcophagidae: Sarcophaga spp., Wohlfahrtia spp.; |
| Oestridae: Dermatobia spp. |
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myi1-ic
Myiasis: infestation
by larvae of flies is called myiasis. The most common
agents of myiasis belong to the genus Gasterophilus (G.intestinalis),
Dermatobia (D.hominis), Auchmeromyia (A.luteola), Calliphora (C.vomitoria),
Callitroga (C.hominivorax), Chrysomyia (Ch.bezziana), Cordylobia
(C.anthropophaga, C.erythrocephala), Lucilia (L.sericata), Phormia (P.regina),
Sarcophaga (S.carnaria, S.haemorrhoidalis), Wohlfahrtia (W.magnifica),
Hypoderma (H.bovis, H.lineatum) and Oestrus (O.ovis).
After deposition of eggs on skin, larvae of flies can burrow into the skin
or penetrate in wounds and subcutaneous tissues where they develop to adults.
The clinical pattern depends on the species of fly and on the site of infestation.
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myi2-ic
Myiasis: larvae
can be found in the skin, in body cavities
(nasal, auditory channel and sinuses)
and in natural tracts (gastrointestinal, urinary).
Skin infestation is the most common form and may present as furuncular
(large painful and pruritic nodules, mainly Cordylobia spp. and Dermatobia spp.)
or creeping eruptions (Gasterophilus spp.), slowly progressive
serpiginous and erythematous tracts.
Infestation by flies of the genus Hypoderma is characterized by general signs
and symptoms (fever, itching, arthromyalgias, hypereosinophylia)
followed by the appearance of furuncular or creeping myiasis.
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myi3-ic
Myiasis: Detail of the cuticle of a
larva.
(Wet mount preparation).
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myi4-es-ic
Myiasis: posterior spiracles of Cordylobia anthropophaga.
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Dermatobia1 |
Dermatobia hominis larva
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Courtesy of
Gilberto
González López:
GEPAMOL |
