Page 3 Line 21: “indicating a more recent origin…”. Again this is only true for your data and should be stated. Serotype O outbreaks have been reported in South America since the initial wave, but clear reports start from 1940-50 (e.g. massive outbreak in Peru in 1962; 1950 official report in Venezuela; 1957 A, O and C in the entire Rio Grande do Sul).
Page 3 Line 21: “indicating a more recent origin…”. Again this is only true for your data and should be stated. Serotype O outbreaks have been reported in South America since the initial wave, but clear reports start from 1940-50 (e.g. massive outbreak in Peru in 1962; 1950 official report in Venezuela; 1957 A, O and C in the entire Rio Grande do Sul).