And a virus does not live on a person for 6 months. I can understand being cautious and paranoid about wanting to protect your investments, pets, and business/babies..
But we live in the age of science, and reason and enlightenment. Lets try to keep the heebie jeebies, "boy" germs, and fake cooties as child hood games.
Since we're dealing with science, reason, and enlightenment, let's consider the fact that many human viruses remain dormant in one's system for the REST OF ONE'S LIFE. Many of them can and do reappear when one's immune system becomes compromised. Example: any virus in the herpes family (including chicken pox). Some viruses can reactivate themselves in one's saliva and continue to infect people with whom one comes in contact. Example: epstein-bar (one of the viruses that causes classic mono). Can we carry viruses that only affect other animals? Yes, but they remain harmless to us and we would never know they are there. Can you be carrying the virus that killed someone else's snakes? Not enough is known about that virus to say yes or no, but I believe the possibility exists.