A microindirect hemagglutination test (IHA) for the determination of type-specific antibody to Herpesvirus homin-is (Types I and II) was developed and evaluated in comparison to the quantitative microneutralization procedure. Paired human sera from 14 patients with complement-fixing antibody rises to herpesvirus were tested with all three methods. The IHA test, as described, appears to be rapid, simple and valuable technique for a detection of Type I and Type II herpesvirus infections and may be useful for classifying herpesvirus isolates.