A long-term bioluminescence test in mice with a systemic bacterial infection. The pSE-Lux1-carrying strain CG354 of K. pneumoniae was intravenously injected into Balb/c mice. The bioluminescence signals from the mice were monitored via an IVIS system during the periods from one hour to six days post-systemic bacterial inoculation. The photos were taken with 0.5-second exposures. The color bar is indicated beside each IVIS image.