The gentleman in India is always adament about life coming from space but he's part of a broader array of scientific thought. That's the one that argues that life on Earth simply isn't unique ~ that if life occurs anywhere it's going to depend pretty much on the same basic chemistry, and it's probably part of the natural process of star formation that life manages to get its start.
Consequently if we get viruses or bacteria from space they'll look remarkably like the ones we already have, and BTW, has anyone found all the viruses on this planet? The answer there is that we haven't, and yet the most cursory examination of the first foot of ocean water is that there are MILLIONS of viruses we haven't the foggiest notion about.
I think I went over to the panspermia idea when reports of exotic bacteria living in rocks deep in the Earth were confirmed. If life came from space it was pretty obvious it ought to be living in rocks buried deep under the surface.