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At the onset of infection, the virus introduces into the cell its genetic material —RNA or DNA— accompanied in many instances by essential proteins.
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Viruses are submicroscopic agents which infect plants, animals and bacteria.
The principal micro organisms involved are all chemoorganotrophs and derive their carbon and energy supply from the metabolism of organic compounds.
Of the Gram-positive organisms, aerobic, endospore-forming bacteria of the genus bacillus, some coryneform bacteria (Corynebacter-ium and Brevibacterium) and the filamentous bacteria (actinomycetes) particularly of the genus Streptomyces are well represented.
Gram-negative types include acetic acid bacteria and Xanthomonads(黄单胞杆菌).
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