AcuteSubacuteChronicLatentFocal infectiondisseminated infectionbacteremiasepticemiaviremiatoxemiaprimary infectionsecondary infectioniatrogenic infectionnosocomial infectionCommunity acquired infectioncleansterilizationDisinfectionsanitationAntisepsis4 biosafety levelsRobert HookeAntonie van Leeuwenhoekspontaneous
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generation
Lazzaro Spallanzani
Louis Pasteur
Flourance Nightingale
Robert Koch
Edward Jenner
attenuated pathogen
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