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. 2015 Feb;21(2):273–279. doi: 10.3201/eid2102.140722

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Antibody mediated bactericidal activity against Haemophilus influenzae type a in healthy Aboriginal (n = 70) and non-Aboriginal (n = 70) adults residing in the Thunder Bay region of northwestern Ontario, Canada, 2010–2012. The solid line indicates geometrical mean titer. The dashed line indicates the lower limit of detection; the number of individual samples below this limit is indicated on the graph.