Fortunately, vaccines are available that may serve to reduce their lethal threat. Here’s what the cat owner needs to know.

By Tom Ewing

A virus, unlike a bacterium or a fungus, is not a living organism. Rather, a virus may best be described as a complex submicroscopic structure consisting of a bit of genetic material — its DNA or RNA blueprint — encased in a protein shell. Although more of a chemical than a creature, a virus nevertheless has an irrepressible inclination to reproduce itself rapidly and without limit in the body of a host animal that it has infected — your cat, for instance. …

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