The subject of Microbiology is the study of most intricate and intimate relationship between the man and the microbe. Medical Microbiology is the science that deals with the study of organisms that cause infectious diseases. At any time an adult human being harbours 100 trillion micro-organisms and these are mostly beneficial. But pathogenicity is a trait exhibited by only a few of them. Consequently tremendous mortality and morbidity is inflicted on man by these organisms.
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