- Receipt of an investigational product (not vaccine-related) within the last 12 months. Receipt of a non-HIV experimental vaccine(s) within the last 5 years in a prior vaccine trial. Exceptions may be made for vaccines that have subsequently undergone licensure by the FDA. For subjects who have received control/placebo in an experimental vaccine trial, or who have received an experimental vaccine(s) greater than 5 years ago, eligibility for enrollment will be determined by the investigators on a case-by-case basis.