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Whether virus are living beings is a philosophical debate since the label changes nothing in the way science researches them. IMO they are biological objects or more precisely, pieces of biological code that need a compatible biological computer (a cell) to replicate itself.
A living being can lose/lack the ability to reproduce, but always has the ability to feed (from sunlight at the very least). A virus does not need to feed, you can't starve it since it does not need oxyigen or nutrients, only an environment where it will not degrade until it can reach a cell that executes its code.
Unlike bacteria or fungi, it does not have any kind of active defense, if T cell we able to recognize them in the spot, it would only need to break it apart.
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