Figure 3

– Percentage of middle ear effusions with detectable wildtype or mutant bacteria. Percentage of successfully tapped ears infected with a mixture of equal numbers of the wildtype strain 86-028NP and the tonB mutant strain HI2280 containing detectable colonies of the wild type strain (black columns) or the mutant strain (grey columns). Using Fisher’s Exact test to compare percentages of effusions with detectable wildtype or mutant strains P < 0.008 on all days.