Global N = 6,826–8,072 M (2010–2029), R0 = 4–13 by WBIL [18, 20]N = 2,526–9,640 M (1950–2100), R0 = 4–13 by WBIL for WPV1, WPV1*0.9 for WPV2, WPV1*0.75 for WPV3 [4, 50–62, 65, 77, 81]