Abstract
From January 1981 to November 1982, a survey was made on the occurrence of Pneumocystis carinii in the lungs of 14 kinds of animals in Japan. P.carinii was found in laboratory rats, laboratory mice, laboratory rabbits, wild rats (Rattus norvegicus and Rattus rattus), wild mouse, cattle, swine, chicken, quails and feral pigeons, but not in goats and guinea pigs and one specimen of golden mountain thrush.