Dependence of bacterial numbers on CDI-mediated competition between opposing CDI⁺ bacteria.

<p><b>A</b>) The log competitive index (C.I. (Log)) is plotted for competitions between <i>Bt</i>-<i>Bp</i>1106a-1 and <i>Bt</i>-<i>Bp</i>1106a-2 bacteria at a 1∶1 starting ratio (with and without immunity as indicated) in the center (C) and edge (E) of colony biofilms. A positive C.I. (Log) indicates the inhibitor bacteria outcompeted the target bacteria, and a negative C.I. (Log) indicates the target bacteria outcompeted the inhibitor bacteria. <b>B</b>) The log competitive index (C.I. (Log)) is plotted for competitions between <i>Bt</i>-<i>Bp</i>1106a-1 and <i>Bt</i>-<i>Bp</i>1106a-2 bacteria at the indicated starting ratios. A positive C.I. (Log) indicates <i>Bt</i>-<i>Bp</i>1106a-1 bacteria outcompeted <i>Bt</i>-<i>Bp</i>1106a-2 bacteria. All samples were taken at 24 hours. Blue data points indicate the C.I. (Log). Red data points indicate only the “winning” (outcompeting) strain was recovered, the actual C.I. is therefore greater than or equal to the represented value.