The Medical Commission here follows a very stringent method of testing newcomers into Qatar. If the person you mention indeed underwent such a test at the Medical Commission, the resuly would DEFINITELY show he or she is HIV positive, if the person is infected. The Medical Commission tests a foreign worker's blood for three diseases- HIV/ AIDS, Tuberculosis and Hepatitis. How can you be so sure that your room-mate is HIV positive or has AIDS without proper medical documentation and records?