[Usefulness of the passive hemagglutination micromethod in the diagnosis of whooping cough].

Studies on modification of diagnostic test for pertussis have been continued, they were practically restricted to an application of passive haemagglutination micromethod. Six hundred and twenty eight sera from children suspected to be infected with Bordetella and 38 sera of control children suffering from non-infectious diseases were tested. Despite of the fact that higher titers were obtained with method using red blood cells preserved in Alsevier solution, the passive haemagglutination micromethod may be used in field studies especially during pertussis epidemics what was confirmed by statistical analysis.