title: Morphological evidence for natural poxvirus infection in rats.
mesh_terms: D000818:Animals; D008297:Male; D008854:Microscopy, Electron; D009297:Nasal Mucosa / Q000382:microbiology / Q000473:pathology; D011212:Poxviridae / Q000302:isolation & purification / Q000648:ultrastructure; D011213:Poxviridae Infections / Q000473:pathology / Q000662:veterinary*; D051381:Rats; D011919:Rats, Inbred Strains; D012376:Rodent Diseases / Q000473:pathology*; D013026:Space Flight; D014586:USSR