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Viruses (General)

Bryan Applications, V

The poison produced in the course of an infective disease and capable of reproducing the disease when inoculated into another person is called a virus. It may contain visible microorganisms, but in some instances no organisms have been demonstrated, though they are presumed to exist.

When the infective virus can pass through a porcelain filter it is called filterable virus. A virus which has had its potency diminished by chemical or other means is called an attenuated virus.