VMD-0091
QUESTION
Which of the following is a commensal organism that inhabits canine skin and ear canals and produces disease under favourable conditions?
OPTIONS
(A) Otodectes cynotis
(B) Sarcoptes scabiei var. canis
(C) Staphylococcus intermedius
(D) Malassezia pachydermatis
ANSWER
(D) Malassezia pachydermatis
EXPLANATION
Malassezia pachydermatis is a lipophilic yeast that normally inhabits canine skin and ear canals but can overgrow and cause dermatitis or otitis when local conditions favor it. Otodectes and Sarcoptes are mites rather than commensal microorganisms, while Staphylococcus intermedius is bacterial and not the specific organism intended here.
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