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Objective To determine age-dependent pertussis specific IgG and IgA antibodies seroprevalence in apparently healthy subjects. Methods A total of 595 healthy 1-35-y-old individuals divided into 5 different age groups were selected from Sari district. Antipertussis IgG and IgA antibodies levels were measured quantitatively by ELISA method. Positive sera for IgA and also IgG titer ≥150 were considered...