Chicken pox is a form of the Herpes Virus. Those of us that have been exposed to the virus in the form of chicken pox as a child usually will not develop it again. HOWEVER, there are some who do get a 2nd case later. There are also some people, like me, who can develop another form of the virus called Shingles (sometimes called adult chicken pox). You can find out a lot about these if you do a simple google search. I know when someone in my environment is sick with chicken pox, I take more care to stay clear until they are better on my doctor's advice. In fact, I do that with any viruses since I know I am extremely prone to "catching" things. Having AI problems does make us at a higher risk than those who don't have AI problems, but only you and your doctor can really say how much higher your risk is from your experiences. BTW, I don't think you sound paranoid at all, but I am also the person who wipes down her work stations (I have 2) every day with lysol wipes. Phones, computer mouse, keyboards, handles, etc. I feel that I can never be too careful too.