Sulzer C R, Glosser J W, Rogers F, Jones W L, Frix M
J Clin Microbiol. 1975 Sep;2(3):218-21. doi: 10.1128/jcm.2.3.218-221.1975.
A presumptive hemagglutination test for the serological diagnosis of leptospirosis in humans is described. The antigen was prepared from a soluble alcohol extract of an andamana strain sorbed to human O-negative erythrocytes and preserved by pyruvic aldehyde fixation. In this study, the overall sensitivity of the hemagglutination test was 92% in contrast to 69% for the presumptive slide agglutination test. The specificity was 95% for the hemagglutination test in comparison with 83% for the slide test.