Answer:
they don't - unless it has divided itself into another cell
viruses are not taken as the living entities.....they are said to be on border line of living and non living and are more accurately accepted as chemical in nature as they can be crystallised unlike living cells......they don't abide by the standards of being living expecting the fact that they replicate in their host cell. thus they can't be said to b surviving outasice host cell....or they need not to survive.