Some people are still freaked out by AIDS like it’s 1985. Get a grip people! Just because someone who had AIDS lived in your house before you bought it does not mean you are going to catch the disease from them. Unless you’ve shared their needles or had sex with them, I’m pretty sure you’re in the clear.
Be more concerned about passing around your flu or cold. Dammit! Cover your mouth EVERY TIME you sneeze or cough and wash your hands (in hot, soapy water) after.