1.Try female condoms, they are much stronger, I’m sure the doll will be thoroughly cleaned beforehand
2. HIV does not survive outside the human body unless suspended in the human fluid such as blood. Most other viruses do not survive very long outside the body either, some of the more hearty ones for a few days. Bacteria is another issue. It can survive for long periods in strange environments. The good news is that a basic cleaning with soap and water will take care of most of them.
3. Here is Sex Doll Cleaning & Caring Guide for you!