74, yes in very cool temp it may stay alive. The body will die and the virus dies too. The virus needs a live host so no more then a week at best. More then that it would have to be very cool, yes (4°C) may stay alive. But the minute that it gets hotter it is over.
If the blood is alive then yes it may stay alive for a long time but if the blood is dead then no.
The point is if the SHTF and there are dead bodies everywhere for months then those bodies will not have live viruses, only if the person dead less then a week then you have a problem.
Here is a good article on viruses in dead bodies, also in this article there is “The body’s defense system” which I have posted many times about how important it is for us to have a strong immune system.