title: Absence of Pneumocystis carinii in Lobund germfree and conventional rat colonies.
mesh_terms: D000375:Aging; D000818:Animals; D005856:Germ-Free Life; D006801:Humans; D008168:Lung / Q000382:microbiology / Q000473:pathology; D009369:Neoplasms / Q000150:complications; D011010:Pneumocystis / Q000302:isolation & purification*; D011020:Pneumonia, Pneumocystis / Q000150:complications / Q000473:pathology; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity