Abstract
Haemophilus influenzae serotype a (Hia) is an important pathogen since the introduction of vaccines for control of disease due to serotype b strains. Using a sodC-based polymerase chain reaction, Hia can be divided into 2 phylogenetic divisions, each with their own unique multilocus sequence types. Most Canadian Hia belongs to clonal division I and the ST-23 clonal complex. The recently described hypervirulent clone of ST-4 was found in a single Canadian isolate. Therefore, surveillance of invasive H. influenzae disease should include serotyping to detect Hia and multilocus sequence typing to detect hypervirulent clones.
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