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A simple method for preparing radial haemolysis gels for rubella antibody screening is described. In use it gave clear zones of haemolysis when a standard serum was tested at dilutions down to 5.6 i.u./ml rubella antibody. In five laboratories 8404 sera were screened by the method and the results were read by comparing zones of haemolysis with that of a standard serum diluted to contain 15 i.u/ml antibody. A zone greater than or equal to 15 i.u./ml, indicating immunity, was given by 7433 (88.4%) of the sera. No zone indicating susceptibility was seen with 748 (8.9%) sera. Small zones, less than 15 i.u./ml standard, were given by 189 (2.2%) sera, and in only 34 cases (0.4%) did non-specific haemolysis interfere with the test readings. Further testing of the radial haemolysis interfere with the test readings. Further testing of the radial haemolysis negative and low positive sera by the haemagglutination inhibition test gave rise to some discrepant results which are discussed.

Rubella antibody measured by radial haemolysis. Characteristics and performance of a simple screening method for use in diagnostic laboratories