microorganismmicrobeprokaryoteBergeyeubacteriumarchaebacteriumeukaryotefungusvirusnormalflorapathogenicmicrobesmicrobiologymedicalmicrobiology2120100423126516GirolamoFracastoro1483-15531546contagiumvivumtheory1567-15721676AntonyvanLeeuwenhoek1632-172314027019LouisPasteur1822-1895261.230RobertKoch1843-19103187618821883190519Kochspostulate1892DmitriIvanowski1864-19311898MartinusBeijerinck1851-1931FriedrichLoefflerPaulFrosch1901WalterReed2050EdwardJenner1749-182318EmilvonBehring1845-191719011929AlexanderFleming1881-19551940HowardFloreyErnstChainGFlemingChainFlorey1945194419471948194819521963201932polymerasechainreactionPCR1994MicroorganismGenomeProjectMGP200252486667199561976L.neumophila198219821992O1391996O157acquiredimmunodeficiencysyndromeAIDS1981LucMontagnier19835lymphopathy-associatedvirusLAVLAV1986humanimmunodeficiencyvirusHIV20HIVCD4+THIV2001HIV60006019471963BaruchBlumbergAustraliaantigen1968hepatitisBvirusHBVBlumberg19761973StephenFeinstonehepatitisAvirusHAV19781989hepatitisCvirusHCVhepatitisEvirusHEVHCVHEVnonA-E1995GBhepatitisGvirusHGV8595GBV-CTTTTVTTV19971TTVDNA678prionprionproteinPrPStanleyPrusiner199719805WorldHealthOrganizationWHOWHO200520301910-1987pH1897-19581955