Frequency of laboratory confirmed rubella cases (as reported by countries using measles case-based surveillance) by age in years with a cumulative age distribution curve, 2002–2009, World Health Organization African Region, N = 25,097. (Reprinted with permission from: Goodson JL, et al. Rubella epidemiology in Africa in the prevaccine era, 2002–2009. Journal of Infectious Diseases 2011. Suppl 1:S215–25.)