Mycobacterial PPD sensitins and the nonspecific reactor problem.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology*; D006168:Guinea Pigs; D009161:Mycobacterium / Q000276:immunology*; D009164:Mycobacterium Infections / Q000276:immunology / Q000662:veterinary*; D013019:South Africa; D014374:Tuberculin Test