The term virus has been derived from latin word
"virion" means "poisonious fluid".
A Russian botanist
D.J.Ivanovasky in the year 1892 discovered these unidentified
organisms. In the year 1898 a Dutch microbiologist M.W.Beijerink
called them as contagium vivum fluidum i.e. living infectious fluid.
For the first time the term virus was used by Louis Pasteur.
These are submicroscopic entities ranging in size from about 20
microns to 50 microns. they are about 50 times smaller than
bacteria.
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