Figure 2From: A national cross-sectional study for poliovirus seroprevalence in the Republic of Korea in 2012: implication for deficiency in immunity to polio among middle-aged peopleLevels of immunity to poliovirus (PV) 1, PV2, and PV3. Low, medium, and high immunity indicate neutralizing ranges of 1:8–1:32, 1:64–1:256, and >1:512. No immunity indicates that there was no titer.Back to article page