FIG 1.

Schematic representation of PDI and control treatments. The diagram summarizes a single or initial treatment with MB+L+ (PDI), MB+L−, MB−L+, and MB−L−. After 10 min of light or dark exposure, cells are serially diluted and plated for CFU counting. For each sequential treatment, fresh TSB is inoculated directly from each of the four different treatment groups and cultured to stationary phase, and treatment is repeated. A separate culture is inoculated from a single colony on a TSA plate to serve as the PDI-naive control.