Background & objective: Measles and Rubella Control Campaign was conducted in Iran in December 2003 targeting both males and females 5 to 25 yr old using measles-rubella vaccine. During the campaign, some pregnant women received vaccine during the first trimester of pregnancy or some others became pregnant shortly thereafter. The goal of this study was to evaluate the risk of congenital rubella syndrome (CRS) among the infants born to the vaccinated mothers.
Methods: A total of 106 pregnant women, who had received vaccine during the first trimester of pregnancy or become pregnant less than three months after vaccination were included in the study for comparison 40 pregnant women without rubella vaccine were also included. The mothers' blood samples at the time of delivery, infants' cord blood and blood samples at the end of the second month of birth of sixty children whose parents agreed about blood sampling, were tested for rubella IgM and IgG antibodies using ELISA method.
Results: There were 107 live births in the exposed group and 42 in the control group. Serological study showed no IgM rubella antibody in the maternal and infant cord blood; it was not found in the second blood specimens of 60 infants tested at 8 wk of age. IgG rubella antibody was positive in all infants' cord blood but it decreased in the second blood specimens of the infants. None of the children exhibited signs of congenital rubella syndrome.
Interpretation & conclusion: Finding of our study showed that none of the infants born to mothers vaccinated by MR vaccine during the first trimester of pregnancy or had become pregnant within three months after vaccination, had CRS.