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Number (n) of N. meningitidis positive subjects in each serogroup stratified by age range.
N = total number of N. meningitidis positive subjects in a given age category.
“Others” includes non-groupable and serogroups E and X. (Serogroups E and X had 1 subject each in 5–9 years and 20–24 year age groups, respectively.).
