Invasive<i>Haemophilus influenzae</i>Disease Caused by Non–Type b Strains in Northwestern Ontario, Canada, 2002–2008

Abstract

A high incidence of invasive non-type b Haemophilus influenzae disease was found in Northwestern Ontario, Canada; H. influenzae type a was the most prevalent serotype (42%). Clinical and demographic analyses indicate that aboriginal children aged <5 years and adults with predisposing medical conditions are the most affected by invasive H. influenzae disease in the post-H. influenzae vaccine era.