Listeria monocytogenes is a model organism for studying immune responses and genetic susceptibility to intracellular bacteria in mice. This method enables one to measure bacterial load and generate single-cell suspensions of the liver and spleen from mice for FACS analysis to determine changes in immune cells due to Listeria infection.
Wang, N., Strugnell, R., Wijburg, O., Brodnicki, T. Measuring Bacterial Load and Immune Responses in Mice Infected with Listeria monocytogenes. J. Vis. Exp. (54), e3076, doi:10.3791/3076 (2011).