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activity agent animal body anthrax antibodies antigen artificial attack bacilli bacteria bacteriology bacteriophage behavior bite blood serum blood stream breeds cancer carriers cattle cause cells changes chemical cholera colonies culture medium developed discovered discovery Doctor effect environment epidemic evidence experimental experiments fact fermentation filtered fleas growth harmless healthy host human immunity infantile paralysis infection infective power influenza inoculated intestinal investigators known Koch laboratory later less living material means method mice microbes microscope monkeys mosquito nasal natural observations occurred organisms outbreak parasite Pasteur patients peculiar persons pestis plague pneumococcus pneumonia poliomyelitis population possible preventive problem produced protective protein psittacosis rabbits rats reactions resistance result Rickettsia Rockefeller Institute rodents sick similar skin specific spread strains substance test tube theory ticks tion tissue transmitted tubercle tuberculosis tularemia tumors typhoid vaccine variation variety virulence virus virus diseases viruses Wu Lien Teh yellow fever