He at Duke University where he investigated how a virulence factor of Salmonella interferes with the function of innate immune cells.Dr. Choi pivoted his focus from gut infection to bladder infection,seeking to understand how host innate immunity protects a host from lower urinary tract infections (UTIs). Dr. Choi's K12 research focuses on providing critical information on the underlying basis for why older women are susceptible to chronic UTIs.