Our lab performs translational investigations of nutritional and microbiota determinants of host-pathogen interactions. We use gnotobiotic techniques (eg. germ free) mice to investigate complex microbe-microbe interactions in the context of host malnutrition, a common but poorly understood global health problem. Specific pathogens we model include Giardia (a ubiquitous parasite with unclear mechanisms of pathogenesis) and other intestinal parasites and multi drug resistant Enterobacterales (eg. Klebsiella). We work with several collaborators to translate findings in experimental models to outcomes in human cohorts. Emerging projects include determinants of host immune responses to mucosal viral infections and vaccines (eg. Polio and SARS-CoV-2).