Use of immunoglobulins and synthetic peptides for the study and prevention of tetanus: W.H. Habig, J.L. Halpern, J.G. Kenimer, E.A. Neale, D.L. Tankersley and M.C. Hardegree (U.S. Food and Drug Administration and National Institute of Child Health and Human Development, N.I.H., Bethesda, MD 20892, U.S.A.)