Fair enough and a good point, but by the time a body is interred that's irrelevant. There's obviously a fair bit of viruses and bacteria that will thrive (or just survive if a virus) in a corpse but stuff like HIV, Hepatitis, Syphilis, etc are going to die with the body. If it's human specific, it's going to be too specific to survive much longer than the human did. There's stuff like MRSA (or any staph infection for that matter) to worry about but that's no different than the carcass of a cow.