Are we aware of a "bug" (virus, bacterium, prion, ...) that has completely exterminated an entire species? Either through direct observation or maybe some form of archeological evidence? If not, are there realistic scenarios where this could happen?
I am primarily interested in cases where the disease was the driving factor of extinction of an otherwise well established and healthy population, but examples of species that were in bad shape to begin with are welcome as well.
My understanding is that this is unlikely, since very deadly infections tend to burn out or evolve towards being less deadly. Killing your host is not conducive to your survival. But maybe it would be possible to reduce the number of individuals so much that reproduction became problematic. I imagine a species confined to an island or something might be susceptible.
I'm asking this because in an interview I saw, an epidemiologist said that his usual research interest are "bugs with species ending potential". The interview was on COVID-19 so he didn't elaborate on what he meant by that or give any examples.
For the special case of humans, I was able to find this article that claims such an event to be unlikely, but I suppose we are the best equipped species that has ever existed on this planet to deal with such a threat.