NAVLE® Question of the day

A three-year-old female goat presents in poor body condition, slightly depressed, and febrile. The goat is mildly pruritic.

The skin shows mild to moderate erythema and alopecia and marked hyperkeratosis and crusting on all four extremities, as shown in the image below.
Skin scrapings are negative for mites.

A cytology taken from the underside of a crust shows parallel stacks or rows of cocci ("railroad tracks") between keratinocytes, also shown below.

Which one of the following choices is the most likely diagnosis?

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