Effect of viruses on cells.

[Bruce Phillips]

	I suspect, can't prove, that probably many viruses that are cytolytic
in vitro may not be in vivo.  Virtually all the hepatitis viruses are currently
thought to be non-cytopathic to cells, disease resulting from the cellular
immune response aimed at killing virus-infected cells.

	Another mechanism of cell killing by viruses may well involve a 
triggering apoptosis- programmed cell death.  I think this is an area of
active interest.