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One THE INVISIBLE GERM page
Two SMALLPOX AND VACCINATION
Three THE SECOND SUCCESS
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able acid and protein amino acids animal viruses antibodies aphid atoms bacteria bacterial viruses bacteriophages bacterium behaviour blood body Britain broth carried caused cell-wall characteristics chemical structure chromosomes cold sores cold virus common cold cowpox d'Herelle dangerous destroyed discovery effect electron microscope epidemic example experiments feed foot-and-mouth disease German measles germs growing herpes simplex virus host human influenza virus inoculated inside the cell invading laboratory living cell living thing membrane millimicrons million molecules monkeys mosquito multiply inside normal nucleic acid nucleus outbreaks paralysis pass photographs plant viruses polio virus polyhedral crystals polyhedral disease potato processes protection protein protein shell psittacosis rabies radio-active radio-active phosphorus Salk scientists smallpox sperm spread strain of virus substances suffering susceptible technique tiny tion tissue tobacco mosaic virus tobacco plant types United vaccine vaccinia virus attack virus disease virus multiplies virus particles virus research volunteers yellow fever virus