title: A new group of rickettsia-like agents recovered from guinea pigs.
mesh_terms: D000818:Animals; D001419:Bacteria / Q000302:isolation & purification; D002642:Chick Embryo; D002751:Chlortetracycline / Q000494:pharmacology; D003168:Complement Fixation Tests; D006168:Guinea Pigs; D007109:Immunity; D010118:Oxytetracycline / Q000494:pharmacology; D010406:Penicillins / Q000494:pharmacology; D012281:Rickettsia / Q000187:drug effects / Q000302:isolation & purification*; D013307:Streptomycin / Q000494:pharmacology
chemical_list: D010406:Penicillins; D002751:Chlortetracycline; D010118:Oxytetracycline; D013307:Streptomycin