The definition of a contact depends on the nature of the disease, and how it is spread. In the case of STIs, your contacts include anyone you have had any sexual contact with, and regardless of whether the sex was protected or unprotected (if you used a condom, for example). Your contacts might include: your sexual partners people with whom you shared needles anyone exposed to your blood anyone who came in contact with your blood, saliva, vomit or body fluids people who may have spent a long time with you in a confined space, such as in an office, classroom or plane close relatives or friends who share your household, or have been in your home anyone who has touched you, for example shook your hand people who ate food that you prepared or made food for you Talk to your doctor if you have any concerns.