CD79A and pertussis: As a result of discriminant analysis, the following novel model was obtained, which makes it possible to predict the probability of detecting IgG in pertussis depending on the gestation period (weeks) and the levels of IgA:YIgG=0.493+0.051×XIgA−0.056×Xwwhere YIgG is a discriminant function characterizing the probability of having IgG antibodies to pertussis, XIgA are the levels of IgA antibodies to pertussis (IU/ml), Xw is the gestation period (weeks).