Fungal infections of respiratory system are the most common reason of death among immunosuppressed patients. Pulmonary candidiasis occurs as a primary bronchopneumonia or secondary type through blood diffusion. Primary bronchopneumonia of Candida, can also occur in patients which had been severely weakened due to tumors, neutropenic patients receiving extensive chemotherapy and infants with very low weight. Aspiration of infectious oral discharges in bronchi and their expansion in pulmonary parenchyma is the main pathway of transmission in Candida bronchopneumonia. In the current research, the most common fungi isolated from respiratory systems were Candida species (91.9%). We certified strains from 38 yeast species, which included almost all medically important yeasts, were cultured on the chromogenic medium and resulting colorful colonies were evaluated. The morphologies of the colonies on cornmeal agar considered as a primary guide for our identifications so then, four Candida species plus C. neopforman as shown at table 2 are the probable alternatives diagnosed in cases suspected to PJP. The results obtained in this work for yeast abundance complied with the findings of other researchers around the world, and indicated that there were almost similar patterns for yeast outbreak in different populations.