The rate of IgG positivity in this study was compa-rable with results in pregnant women in Mwanza, Tanzania (92.6%),11 in Osogbo, Nigeria (87.5%)12 and in Cameroon (88.6%).13 The rate in Zaria, Nigeria (97.9%)14 was relatively higher than our finding despite the absence of a vaccination programme in both contexts. Contrasting lower rates were also reported in Western Sudan (65.3%)15 and in Algeria (68.6%).16 The differ-ence in rate of past exposure to rubella between coun-tries may indicate a varying epidemiology of the infection in different settings. However, the observed rates of past exposure in the current study or other reports in different African countries were generally high and indicated a sustained circulation of the infection in the region. The case-based surveillance data in Africa suggest that most children are exposed to the virus by the age of 15years and developed immunity as a result of natural infection.8However, the current study showed that 13.7% of the pregnant women were negative for antirubella IgG and did not have immunity against the infection. Thus, the observed intermediate level of susceptibility (10%–20%)