Etiology: Pneumocystis oryctolgi is a fungal organism.
Incidence: Pneumocystis oryctolgi is most commonly found in weanling European rabbits.
Transmission: Cysts are horizontally transmitted by inhalation through direct contact with shedding rabbits.
Clinical Signs: Infection is subclinical and produces mild interstitial pneumonia.
Diagnosis: Histologic recognition of cyst forms on silver-stained sections of lungs with typical pneumonia is commonly performed (A). Lung tissue can be subjected to Pneumocystis PCR. Serology can be used to detect anti-Pneumocystis antibody in serum.