This paper describes a simple and rapid immuno-dot blot assay for the detection of antibody to HIV. It utilizes nanogram quantities of HIV lysate, immobilized on nitrocellulose paper, and microliter quantities of serum or culture supernatants for the detection of antibody. The test is highly sensitive and specific. It offers the opportunity to perform multiple assays at a minimal cost and provides the additional advantage of not requiring any sophisticated or expensive equipment to perform the test or interpret the results.