oa South African Medical Journal - Serological studies on human plague in Southern Africa - Part I. Plague antibody levels in a population during a quiescent and a subsequent active period in an endemic region



Yersinia pestis fraction I passive haemagglutination studies on human sera obtained randomly during a plague epidemic showed a 10-fold increase in occurrence of antibodies compared with the results obtained on sera from the same population 11 months earlier during a quiescent phase.


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