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Adherence of M. catarrhalis strain O35E (black bars) and mha mutants (open bars) to human epithelial cells in vitro. Adherence is expressed as the percentage (±standard error) of inoculated bacteria bound to epithelial cells following a 5-min incubation (shown on y axes). The Mann-Whitney test was used to determine whether decreases in adherence were statistically significant (*, P < 0.05).
