title: Robert Koch and the modern investigator.
authors: Harvard School of Public Health, Boston.
authors: T H
authors: TH
authors: Weller
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000821:virology; D000818:Animals; D003141:Communicable Diseases / Q000209:etiology / Q000266:history*; D005060:Europe; D049672:History, 19th Century; D006801:Humans; D012106:Research / Q000639:trends