Abstract
Thirty-nine group B arboviruses have been titrated by a simple micro-culture method. The technique uses a stable line of pig kidney cells (PS cells) in which plaques develop when cells are first infected in suspension in the wells of haemagglutination trays and are then incubated for from 3 to 10 days under an overlay containing carboxymethyl-cellulose. This method can be adapted to measure neutralizing antibodies, and the principle underlying the test is applicable to other cells and other viruses.
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