Susan J. Little, M.D. is a Professor of Medicine in the Department of Medicine, Division of Infectious Diseases, at the University of California, San Diego (UCSD). Dr. Little received her medical degree in 1987 from the Washington University School of Medicine, and then completed her residency in Internal Medicine at Barnes Hospital in St. Louis, Missouri and her Infectious Diseases fellowship at UCSD.

Since joining the UCSD faculty in 1993, Dr. Little has developed one of the leading and most productive National Institute of Allergy and Infectious Diseases (NIAID)-sponsored programs in the United States for the identification, enrollment, and treatment of individuals with acute and recent HIV-1 infection. She directed an NIH-funded Program Project at UCSD to evaluate determinants of HIV transmission and now serves as PI of the San Diego Primary Infection Resource Consortium (PIRC), a program focused on research related to HIV prevention, transmission and pathogenesis. Dr. Little has published extensively in peer-reviewed journals including the New England Journal of Medicine, AIDS, Clinical Infectious Diseases, Journal of Virology, Lancet Infectious Diseases, and Annals of Internal Medicine.

Dr. Little is actively involved in the training and mentoring of undergraduate and graduate students, post-doctoral research fellows and junior faculty. She serves as Co-Director of the Antiviral Research Center (AVRC), the major site of UCSD clinical and translational research trials related to HIV/AIDS, hepatitis, influenza, tuberculosis and other infectious diseases of global impact.