Demonstration of inapparent infection with disease agents common to animals and man.
D000372:Agglutination Tests; D000382:Agricultural Workers' Diseases / Q000453:epidemiology* / Q000276:immunology; D000818:Animals; D000906:Antibodies / Q000032:analysis; D002417:Cattle; D003168:Complement Fixation Tests; D006801:Humans; D011778:Q Fever / Q000453:epidemiology* / Q000276:immunology; D012882:Skin Tests; D014922:Wisconsin; D015047:Zoonoses / Q000453:epidemiology*
D000906:Antibodies