vorax strain V,. Serological relationships were determined by three procedures: immobilization, agglutination, and complement fixation. Antigenic relationships in general were dependent upon the method employed. The immobilization test provided the best method for uncovering these differences. The complement fixation test did not provide satisfactory identification of the different species.

Since the publication of the original complementfixation test for syphilis by Wassermann, Neisser, Bruck, and Schucht (1906) and the publication of the flocculation test of Porges and Meier (1908), innumerable modifications have been described for the improvement of both diagnostic methods. The technical complexity of the former furnished an incentive for the development of the latter. Yet, des...

A large proportion of high titre Coxsackie B5 complement-fixation tests was detected among sera giving false positive Wassermann reactions during 1969. Echo virus type 9 proved to be the prevailing enterovirus and is one of those which induces the formation of antibody to Coxsackie B5. One case of Echo virus type 9 meningitis is presented which produced a false positive Wassermann reaction and ...

A complement fixation test modified by the addition of porcine serum and an indirect hemagglutination test were used to detect antibodies to Pseudomonas pseudomallei in pigs. These tests together with cultural examinations were carried out with 250 pigs. The sensitivity and specificity values were 79.3 and 99.5% and 82.8 and 93.2% for the modified complement fixation and hemagglutination tests,...