<qa>  What is the HVTN 112 PSRT determined for volunteers who have received an experimental vaccine- Non-HIV experimental vaccines received 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 volunteers who have received controlplacebo in an experimental vaccine trial, the HVTN 112 PSRT will determine eligibility on a case-by-case basis. For volunteers who have received an experimental vaccines greater than 5 years ago, eligibility for enrollment will be determined by the HVTN 112 PSRT on a case-by-case basis. 