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24 Cards in this Set
- Front
- Back
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what is a "specific" designation of a myiasis of a lifecycle?
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humans are a necessary host in a lifecycle involving the larvae of a fly
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what is a "semispecific" designation of a myiasis of a lifecycle?
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humans are a usable but not necessary host in a lifecycle involving the larvae of a fly
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what is a "accidental" designation of a myiasis of a lifecycle?
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humans are not a necessary host, in fact they usually aren't a host at all and when and if they become a host it is purely accidental in a lifecycle involving the larvae of a fly
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what is myiasis?
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human infection by fly larvae
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What is the scientific name of the Tumbu Fly and what type of myiasis does it represent?
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Cordylobia anthrophaga
specific myiasis |
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What is the scientific name of the Scabies Mite and what type of myiasis does it represent?
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Sarcoptes scabiei
none |
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What is the scientific name of the Human Bot and what type of myiasis does it represent?
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Dermatobia hominis
specific myiasis |
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What are common flies to use to find the PMI?
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Flesh fly - Sacrophaga spp
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How does a scabies infection present?
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tunnels under the skin and presents as a ulcerated rash
(pic) |
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Tx for scabies?
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permethrin cream
lindane cream - do not use on wet, irratated, pregnant, nursing orally: ivermectin benadryl |
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What is Norwegian Scabies?
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very severe form of scabies infection that forms crusted lesions and occurs most often in immunocompromised
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What is the scientific name for deer ticks?
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Ixodes dammini
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What is significant about Ixodes dammini mouthparts?
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They are mechanically enabled to anchor into host and there is a chemical that is released that acts as a chemical adhesive
(pic) |
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What is the scientific name for head lice?
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Pediculus humanus
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What are nits?
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the egg case for head lice that adhere to hairs that contains several eggs
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What is the scientific name for Crab lice?
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Phthirus pubis
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What are the three common specific myiasis organisms?
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1) Dermatobia (human botfly)
2) Cordylobia (tumbu fly) 3) Cochliomyaia hominivorax (primary screwworm fly) |
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What is the steps leading up to infection of a Dermatobia?
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1) adult bot flies capture mosquito and lay eggs on the underside of the mosquito
2) larvae contained in eggs hatch because of heat from human skin and crawl down to skin 3) larvae burrow into human skin |
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What are symptoms associated with phase 1 of Dermatobia infection?
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red lesion with a central hemorrhagic point that is slowly growing over the course of about 3 weeks
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What are symptoms associated with phase 2 of Dermatobia infection?
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central hemorrhagic point becomes nodular lesion in which the tail of the larva emerges in order to breathe. lesion is painful, indurated, erythematously haloed
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What is the difference between the Human botfly and the Tumbu fly?
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they present similarly, so the differences are:
1) botfly = S. America; tumbu = Africa 2) botfly = mosquito transfer; tumbu = eggs are picked up from clothing or urine soaked medium 3) botfly = cover breathing hole w/ animal fat to kill; tumbu = cover breathing hole w/ mineral oil to kill |
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What organism plants larvae in sheep nasal cavities?
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Oestrus ovis (sheep bot fly)
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What is the significance of Sarcophaga (lresh fly) and the Lucilia spp (green bottle fly)
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this flesh fly will be the first to invade decomposing tissue and is used to determine PMI (forensic post-mortem interval)
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What is significant about semi-specific myiasis organisms?
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used in forensic science
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