Skin Infection: Infestations Flashcards
morphology of a scabies infection
burrow
Clinical Features: Scabies is a ____ ____ caused by infestation with ___
scabiei var. hominis. This is an eight-legged mite which is too small to be seen by the naked eye. The entire 30-day life cycle of mites is completed within the ____. The number of mites living on an infested host can vary greatly, although there are usually fewer than a hundred and often no more than 10–15. The incubation period before symptoms develop can range from days to months. In first-time infestations, it usually takes 2–6 weeks before the host’s immune system becomes sensitized to the mite or its by-products, resulting in pruritus and cutaneous lesions.
Clinical Features: Scabies is a pruritic dermatitis caused by infestation with Sarcoptes
scabiei var. hominis. This is an eight-legged mite which is too small to be seen by the naked eye. The entire 30-day life cycle of mites is completed within the epidermis. The number of mites living on an infested host can vary greatly, although there are usually fewer than a hundred and often no more than 10–15. The incubation period before symptoms develop can range from days to months. In first-time infestations, it usually takes 2–6 weeks before the host’s immune system becomes sensitized to the mite or its by-products, resulting in pruritus and cutaneous lesions.
topical treament for scabies
Two topical treatments (1 week apart) with an anti-scabietic medication is recommended.
The topical preparation is applied overnight to the entire body surface, from head to toe, in infants and the elderly. In other age groups, the face and scalp can be excluded from treatment.
Special attention should be paid to the interdigital spaces, intergluteal cleft, umbilicus and subungual areas. Permethrin cream is the topical treatment of choice except for children under age 2. For under age 2, 5-10% ppt sulfur in white petrolatum applied overnight for 3 days is considered safe.
To reduce the potential of reinfestation by fomite transmission, at the time of each treatment, clothing, linens and towels used within the previous week can be either washed in hot water and dried on high heat or stored in a bag for 10 days.
T/F pets can harbor scabies
false
treatment of lice
Head lice are spread by head-to-head contact as well as by fomite transmission
Resistance to traditional over-the-counter preparations (pyrethrins, permethrin) is growing; topical malathion and oral ivermectin can be used in resistant cases
With all topical preparations (regardless of package instructions), two applications, 1 week apart, are advisable, to: (1) kill any nits that survived treatment (2) better defend against the seemingly growing resistance to most pediculicides (3) reduce the risk of reinfestation by means of fomites.
why do most infestations require two treatments
With all topical preparations (regardless of package instructions), two applications, 1 week apart, are advisable, to:
(1) kill any nits that survived treatment
(2) better defend against the seemingly growing resistance to most pediculicides
(3) reduce the risk of reinfestation by means of fomites.
scabies burrow
scabies
intense scabies
genital manifestations of scabies
lice aka pediculosis capitis
