Nucleotide sequence diversity of the bexA gene in serotypeable Haemophilus influenzae strains recovered from invasive disease patients in Canada.

The bexA genes of 36 Haemophilus influenzae isolates were sequenced to reveal their nucleotide sequence diversity, which divided them into two groups, similar to clonal divisions I and II. This sequence diversity may lead to false-negative PCR results for H. influenzae infections if bexA is the chosen gene target.