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active agent Amer animals antigen appear attack bacteria bacteriophage Bakt Bedson Berkefeld Berl Biol bodies Borna disease brain Brit c.cm C.R. Soc cattle cells cent clinical culture d'Herelle described dilution distemper dogs dose emulsion encephalitis encephalitis lethargica endemic typhus epidemic eruption evidence experimental experiments fever filterable filtrate fluid foot-and-mouth foot-and-mouth disease fowl fowl-pox glycerin guinea-pigs herpes histological horses ibid immunity inclusions incubation period infection InfektKr infiltration inoculation Inst intracerebral klin lesions Levaditi lice lymph lysed lysis material method monkeys mucous membranes nature Negri body Nicolau normal observed obtained occur Olitsky organism Orig Paris particles passage Pasteur Path phage poliomyelitis present produced prowazeki rabbits rabies reaction resistant rickettsia serum sheep sheep-pox similar skin smallpox specific strains subcutaneous susceptible symptoms temperature tissue transmission transmitted tumour typhus usually vaccine vaccinia variola vesicles virulent blood virus virus diseases viruses warts Wschr