Do zombie viruses exist

There is a fungal parasite called Ophiocordyceps that will infect insects like ants. It takes them over, starts to devour parts of them, and forces the ant to do it's bidding and behave in uncharacteristic manners.
Once the ant is deceased past the point of mobility the parasite will move on to infect a new host. There is also one that takes over rats it has a weird french name but if you google zombie rats it will come up.