“…Measurement of immunity to tetanus has traditionally been based on the toxin neutralization test. Several methods have been adopted to measure the amount of antibodies to tetanus toxoid, including radioimmunoassay (6,7,11,22), latex agglutination (1), and enzyme-linked immunosorbent assay (ELISA) (2,3,5,6,11,18,19,23). Various solid-phase immunoassays have found increasing use in recent years in the determination of bacterial antibodies in human sera.…”