When Lorenzo Taylor applied for the Foreign Service he was rejected on the grounds that his being H.IV. positive would hinder his ability to perform his job. It is the policy of the State Dept. that applicants cannot have medical problems that prohibit them from serving in isolated posts or in primitive areas. Taylor's lawyer argues that refusing to hire a person because they are H.I.V. positive is a violation of the federal Rehabilitation Act because it amounts to discriminating against people with disabilities.
See "Applicant With H.I.V Sues State Dept", Christopher Marquis, The New York Times, September 3, 2003