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The Times Change
The Way of a Parasite
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activity agent animal body anthrax antibiotic antibodies antigen appear artificial attack bacilli bacteria bacterial cell bacteriologist bacteriophage behavior blood stream breeds cancer carriers cause changes characteristic chemical cholera colonies containing crobes culture medium developed discovery disease disease-producing Doctor drug effect environment enzyme epidemic epidemic typhus experimental experiments fact fermentation fungus germs growth host human immunity important infection influenza inoculated intestinal investigators isolated known laboratory later living material means method mice microbes microscope molds monkeys mosquito mutation natural nucleic acid observations occurred organisms outbreak parasite Pasteur patients penicillin persons pestis plague plants pneumococcus pneumonia poliomyelitis poliovirus population possible prevent problem produced protective protein psittacosis rabbits rats reactions resistance result rickettsial rodents skin specific spores spread strains streptomycin substances susceptible test tube ticks tion tissue tubercle tuberculin tuberculosis tularemia tumor typhoid typhus vaccine variation virulence virus viruses Wu Lien Teh yellow fever