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A meaningful classification scheme based on the genetic relatedness of many
viruses may eventually result from recent studies concerning the degree of
similarity between the dna of one virus and that of another. In the mean- Names
of time, ...
Viral mutants with reduced virulence are known as attenuated strains; such
mutants have less severe effects on the host cells than does the parental strain.
Attenuated strains, however, which are often used in vaccines, frequently have
The attenuated strains of virus, such as those used in vaccines, usually result in
apparent infections. If the host has some level of immunity to the virus, however,
these infections are often transient and inapparent as well. In such inapparent ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review