These factors make the host more likely to pass the virus on

But before it does, it often increases its host's aggressiveness and ramps up the production of rabies-transmitting saliva, while making it hard to swallow. These factors make the host more likely to bite another animal and more likely to pass the virus on when it does. And now, meet Ophiocordyceps,
also known as the zombie fungus. Its host of choice is tropical ants that normally live in treetops.