| Summary: | Objective: This study investigated the adverse pregnancy outcomes among pregnant women with acute Rubella infections in the city of Mwanza, Tanzania. Methods: A longitudinal study was conducted between 2014 and 2016 among pregnant women attending antenatal clinics. Women were screened for Rubella IgG and IgM antibodies using enzyme immunoassay (EIA). IgM seropositive pregnant women were followed up until the end of the pregnancy to determine Congenital Rubella Syndrome, congenital infections and other pregnancy outcomes. Results: The median age of 685 enrolled pregnant women was 23 (IQR: 19–27) years. A total of 629(91.8%) were Rubella IgG seropositive while 61 (8.9%) were IgM seropositive. The IgM seropositivity was found to decrease significantly from first trimester to third trimester, p < 0.001. Forty six (83.6%) of 55 Rubella IgM seropositive women had adverse pregnancy outcomes and 6 (10.9%) delivered neonates with CRS, making the overall incidence of CRS to be 6/685 (0.87%). First trimester IgM seropositive women had significantly higher adverse pregnancy outcomes than those in second/third trimesters (70.4% vs. 35.7, p = 0.01). Conclusion: There is one case of CRS in every 100 pregnancies necessitating additional strategies to reach a goal of elimination of CRS in developing countries. Keywords: Pregnant women, CRS, Acute Rubella, Tanzania
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