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Part VIII. Ectoparasites

Your patient is a homeless person with several papules on his hands that are very pruritic. One lesion is a linear track. You suspect the patient may have scabies. Which one of the following is most likely to be seen?

(A) Nits are seen attached to hair.

(B) Visual inspection reveals a larva in the lesions.

(C) The nymph form of a tick is seen in the lesions.

(D) Examination of a skin scraping in the microscope reveals a mite.

Regarding the patient in Question 1, which one of the following is the best drug to treat the infection?

(A) Albendazole

(B) Ivermectin

(C) Permethrin

(D) Praziquantel

(E) Primaquine

Your patient has recently returned from a trip to Central America that included a 2-week trek in the tropical rainforest. She now has a raised erythematous lesion on her leg that is quite painful. A 7-day course of cephalexin has had no effect. Which one of the following is the most likely cause?

(A) Carex lenticularis

(B) Dermatobia hominis

(C) Latrodectus mactans

(D) Pediculus humanus

(E) Phthirus pubis

Regarding pediculosis, which one of the following is most accurate?

(A) Nits are the eggs of the louse and are typically found attached to the hair shaft.

(B) Praziquantel is the drug of choice for pediculosis caused by both Pediculus and Phthirus.

(C) To visualize the organism, a skin sample should be examined using the 10× objective in a light microscope.

(D) The lesions caused by the body louse are pruritic, but the lesions caused by the pubic louse form a painful necrotic black eschar.

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