This lung lesion was identified at the autopsy of a 40-year-old man infected with human immunodeficiency virus (HIV). It is illustrated here in a hematoxylin and eosin stained section and a silver methenamine impregnated section. This lesion is caused by a
A) bacterium
B) fungus
C) virus
D) protozoon
E) nematode

Question

This lung lesion was identified at the autopsy of a 40-year-old man infected with human immunodeficiency virus (HIV). It is illustrated here in a hematoxylin and eosin stained section and a silver methenamine impregnated section. This lesion is caused by a 
A) bacterium 
B) fungus 
C) virus 
D) protozoon 
E) nematode

Quizplus · Accepted Answer

This pneumonitis is caused by Pneumocystis carinii, a fungus that infects the lungs of AIDS patients. In the hematoxylin and eosin stained slides, there are alveoli filled with finely granular amorphous material. This material contains fungi that can be demonstrated as a black structure in the silver impregnated slide.

This Lung Lesion Was Identified at the Autopsy of a 40-Year-Old