I would also suggest that you contact your physician for further information. We'd be more comfortable with them if they were, but by the rules we've established, they're not. They clearly cannot respire, grow or reproduce on their own. Perhaps the following definition in the next question would be of use. Viruses, known to cause cancer in animals, are suspected of causing cancer in humans.
Viruses also cause measles, mumps, yellow fever, poliomyelitis, influenza and the common cold.
Some viral infections can be treated with drugs. One of the purposes of the Big Picture Book is to provide one location where individuals such as yourself can gain access to needed images. For permission to use one of these images, I would suggest that you contact the owner of the particular image of interest. By clicking on the image of interest, you will be connected to the owner's web site. I'm pleased that my web site may have been of assistance to you.