IL23A and infection: IL-23 has been described to play a protective role against extracellular or vacuole-bound pathogens such as Klebsiella pneumoniae[10], [11], Citrobacter rodentium[12], [13], and Salmonella enterica[14], [15], as well as against infections with Toxoplasma gondii[16], [17] and Candida albicans[18], [19], [20].