Parasitic Infestations (Scabies, Pediculosis) MCQs

Dermatology · 8 free questions with answers & explanations.

1. An entire family presents with intense nocturnal pruritus and multiple papules, vesicles, and linear burrows between the fingers, wrists, and genitalia. Microscopy of material from a burrow shows a mite, eggs, and scybala. What is the first-line treatment?
2. Norwegian (crusted) scabies differs from classical scabies in that it occurs predominantly in immunocompromised patients. Which of the following best explains its distinctive clinical appearance?
3. Norwegian (crusted) scabies differs from ordinary scabies in that the mite burden is extremely high (millions vs. 10-15 in ordinary scabies). The reason affected patients do NOT exhibit pruritus despite massive infestation is:
4. Norwegian (crusted) scabies differs from classical scabies in all of the following EXCEPT:
5. A 70-year-old immunocompromised patient in a nursing home presents with generalized thick crusted lesions over the scalp, face, and hands. Microscopy of scrapings shows hundreds of Sarcoptes scabiei mites and eggs. The treatment of choice and the precautionary measure required are:
6. Norwegian (crusted) scabies is seen in immunocompromised patients and is characterised by hyperkeratotic plaques with thousands to millions of mites. In a dermatology ward outbreak, the single most appropriate management step is:
7. Norwegian (crusted) scabies carries an extraordinarily high mite burden (millions of mites) and is a significant nosocomial infection risk. The first-line treatment for Norwegian scabies is:
8. A nursing home outbreak of scabies affects 35 residents and 12 staff. Three residents have hyperkeratotic plaques on palms and soles with thousands of mites — crusted (Norwegian) scabies. First-line treatment for the index cases (crusted scabies) and their close contacts is: