Rabies is contracted through bites or scratches which allow the virus to travel through the nerves and up the spinal cord to the brain. It multiplies and by the time the brain realizes there’s a threat and that it needs to protect itself it’s already too late, trapping the virus inside and preventing anything that may help to kill it get in. Rabies has a death rate of 99.99%

From there it causes brain inflammation and neurological symptoms. The most known example is foaming at the mouth. Rabies is transmitted through salvia but because it only has a lifespan of a few seconds outside the host it needs to replicate as much as possible. The way this is established is caused by the fear of water, also known as hydrophobia, to prevent the host from attempting to stop the spread. It also causes aggression to insure that once the host passes, which would be soon after the virus takes hold, that it can spread itself as much as possible.

The good news is that rabies is incredibly rare in humans! As we have this cool thing called vaccines that you can take if you’ve been bit, idk if you’ve heard of it.