Competitive index (CI) measurements of a <i>sirA</i> mutant in mouse models.

<p>A) 10⁷ wild-type MA43 and <i>sirA</i> mutant MA45 in germ-free mice, via the intragastric route (i.g.) and recovered from the cecum after 24 hours. B) 10⁷ wild-type MA43 vs <i>sirA</i> mutant MA45 in germ-free mice mono-associated with <i>Enterobacter cloacae</i>, via the i.g. route and recovered from the cecum after 24 hours. Each point represents the CI from one mouse with the median shown by a horizontal line. Statistical significance of each group being different than 1 was determined by using a one sample Student's <i>t</i> test. Statistical significance between groups was determined using a Mann-Whitney test. * = P value<0.05, *** = P value<0.001.