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Background Histo-blood group antigens (HBGAs), whose expression is controlled in part by fucosyltransferase 2 (FUT2) and 3 (FUT3) genes, serve as receptors for norovirus and rotavirus. Individuals without functional FUT2 (nonsecretors) or FUT3 (Lewis-negative) genes may have decreased susceptibility to norovirus and rotavirus infections. As the prevalence of secretor and Lewis status can vary by race and ethnicity, we assessed this association in a US Veteran population. Methods Stool and saliva specimens were collected from acute gastroenteritis (AGE) cases and age- and time-matched controls through a multisite, active surveillance platform at four Veterans Affairs hospitals (Atlanta, Bronx, Houston, Los Angeles). Stool specimens were tested with the FilmArray Gastrointestinal Panel; norovirus and rotavirus positive specimens were genotyped. Saliva specimens were analyzed for HBGA expression by EIA using glycan-specific monoclonal antibodies and lectins. Chi-squared and Fisher’s exact tests were conducted to evaluate associations between secretor and Lewis status and infection with norovirus or rotavirus. Results From November 4, 2015–December 30, 2017, 670 AGE cases and 319 controls provided both stool and saliva specimens. Norovirus (21 GII.4 Sydney, 13 GII non-4, 7 GI, 10 untyped) and rotavirus (13 G12P[8], 1 G2P[4], 1 untyped) positive cases were more likely to be secretor positive (90% and 100%, respectively) compared with controls (76%) (P = 0.03 for both). Infections with GII.4 Sydney norovirus (P < 0.01) and G12P[8] rotavirus (P < 0.05) were significantly associated with secretor status. This association was not observed with other norovirus or rotavirus genotypes. No association was observed between Lewis status, race, or ethnicity and infection with norovirus or rotavirus. Conclusion Norovirus and rotavirus infections among a US Veteran population were associated with secretor status in a genotype-dependent manner, and with GII.4 Sydney norovirus and G12P[8] rotavirus, the most common strains. These associations are consistent with previously reported results, and suggest that the efficacy of interventions, such as vaccines, should include consideration of secretor status and predominantly circulating virus strains. Disclosures R. L. Atmar, Takeda Vaccines, Inc.: Investigator, Research grant. V. C. Marconi, ViiV: Investigator, Research support and Salary. Gilead: Investigator, Research support. Bayer: Investigator, Research support.

652. What Is Blood Got to Do with It? Genetic Susceptibility to Norovirus and Rotavirus Infection: Results From the SUPERNOVA Network