An AIDS patient with pneumonia has a BAL that demonstrates small, "hat-shaped" structures in alveoli that are about the size of an RBC and stain with silver stain. Most likely cause?
a. This suggests Pneumocystis jerubecii pneumonia.
b. This is non-cultivable fungus, which exists in a cyst and the trophozoite form. Best sample for diagnosis is bronchoalveolar lavage.
c. The organism can be demonstrated in the respiratory specimens by silver staining, giemsa staining and direct immunofluorescent staining.