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That's pretty typical for parasites (which include viruses).

Killing your host is never a good idea, the best parasites cause minimal disruption to their host.

All animals and humans are infected with countless parasites, but you never notice. For example https://en.wikipedia.org/wiki/Face_mite (don't scratch).

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Sometimes if the parasite moves from host to host as part of it's life cycle, and this can include aiding the death of one host. An example of this is a parasite that causes frogs to grow extra legs so that they are easier to catch for birds. The parasite then transfers to the bird, where it can lay it's eggs.

http://phenomena.nationalgeographic.com/2013/02/13/a-flurry-...

Parasites can have multiple host species, some in which they are benign and some in which they are deadly. Malaria has been killing humans for thousands of years. Also for example, HIV.

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