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28 Cards in this Set
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myiasis |
invasion of living vertebrate animal tissue by fly larvae |
Lecture 23 |
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common names for myiasis |
fly strike blow fly strike |
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Categories of myiasis |
Obligate, facultative, accidental |
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obligate myiasis
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flies involved are ALWAYS parasitic and require a living host for development
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Examples of obligate myiasis |
bot flies and primary screwworms |
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Facultative myiasis |
opportunistic flies that have the ability to exploit living tissue but don't always do so |
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Examples of facultative myiasis
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invasion of open sores of cattle by bowfly larvae which normally feed on carrion
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Accidental myiasis/pseudomyiasis
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fly larvae involved are normally not parasitic but under certain condition become so
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Lecture 23
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Examples of accidental myiasis
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ingestion of feed contaminated with fly eggs or larvae
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Lecture 23
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How is myiasis categorized?
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site of infestation
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Families of parasites in Vet Med of economic importance regarding myiasis
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bot flies, calliphorids, sacrophagids
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Lecture 23
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Common name of Cochliomyia hominivorax
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primary screwworm, new world screwworm, American screwworm
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Lecture 23
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Distribution of C. hominivorax
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former: tropical and temperate America, Eradicated from N. America and Panama/Columbia
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Where do female C. hominivorax lay their eggs?
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uninfected wounds or orifices
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What animal can be affected by C. hominivorax?
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any mammal
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How many eggs can a C. hominivorax female lay?
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100-300
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How long do eggs of C. hominivorax have to incubate?
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10-20 hr
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How long do larvae of C. hominivorax feed?
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4-12 days
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How many instars does C. hominivorax have?
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3
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How long is the life cycle of C. hominivorax from egg to egg?
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2-3 weeks
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Where do females of C. hominivorax deposit eggs?
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on mucus membranes and in wounds
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Lecture 23
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How did eradication of C. hominivorax occur?
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irradiated males and females self eliminated (only mate once)
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Lecture 23
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What unique feature allows identification of C. hominivorax larvae?
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pigmented dorsal tracheal trunks in posterior segements
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Lecture 23
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Chrysomya bezziani
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old world screwworm fly, adults lay eggs in purulent wounds
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Cochliomyia macellaria
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secondary screwworm fly; adults lay eggs in purulent wounds
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Genra of blow/bottle flies
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Phaenicia, Phormia, Lucilia, Calliphora
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What kind of wounds are blow/bottle flies attracted to?
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infected, urine scald, hair matted with feces
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Flesh flies
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Sarcophaga, Wolfhartia, feed on decaying flesh and carcasses
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Lecture 23 |
