Rebecca L Currier1, Daniel C Payne2, Mary A Staat3, Rangaraj Selvarangan4, S Hannah Shirley5, Natasha Halasa6, Julie A Boom7, Janet A Englund8, Peter G Szilagyi9, Christopher J Harrison4, Eileen J Klein8, Geoffrey A Weinberg9, Mary E Wikswo2, Umesh Parashar2, Jan Vinjé2, Ardythe L Morrow3. 1. Cincinnati Children's Hospital Medical Center University of Cincinnati Medical Scientist Training Program University of Cincinnati Molecular Epidemiology in Children's Environmental Health Training Program, Ohio. 2. Centers for Disease Control and Prevention, Atlanta, Georgia. 3. Cincinnati Children's Hospital Medical Center. 4. Children's Mercy Hospitals and Clinics, Kansas City School of Medicine, University of Missouri-Kansas City. 5. Centers for Disease Control and Prevention, Atlanta, Georgia Atlanta Research and Education Foundation, Decatur, Georgia. 6. Vanderbilt University Medical Center, Nashville, Tennessee. 7. Baylor College of Medicine, Houston, Texas. 8. Seattle Children's Research Institute, Washington. 9. University of Rochester School of Medicine and Dentistry, New York.
Abstract
BACKGROUND: Norovirus is a leading cause of acute gastroenteritis (AGE). Noroviruses bind to gut histo-blood group antigens (HBGAs), but only 70%-80% of individuals have a functional copy of the FUT2 ("secretor") gene required for gut HBGA expression; these individuals are known as "secretors." Susceptibility to some noroviruses depends on FUT2 secretor status, but the population impact of this association is not established. METHODS: From December 2011 to November 2012, active AGE surveillance was performed at 6 geographically diverse pediatric sites in the United States. Case patients aged <5 years were recruited from emergency departments and inpatient units; age-matched healthy controls were recruited at well-child visits. Salivary DNA was collected to determine secretor status and genetic ancestry. Stool was tested for norovirus by real-time reverse transcription polymerase chain reaction. Norovirus genotype was then determined by sequencing. RESULTS: Norovirus was detected in 302 of 1465 (21%) AGE cases and 52 of 826 (6%) healthy controls. Norovirus AGE cases were 2.8-fold more likely than norovirus-negative controls to be secretors (P < .001) in a logistic regression model adjusted for ancestry, age, site, and health insurance. Secretors comprised all 155 cases and 21 asymptomatic infections with the most prevalent norovirus, GII.4. Control children of Meso-American ancestry were more likely than children of European or African ancestry to be secretors (96% vs 74%; P < .001). CONCLUSIONS: FUT2 status is associated with norovirus infection and varies by ancestry. GII.4 norovirus exclusively infected secretors. These findings are important to norovirus vaccine trials and design of agents that may block norovirus-HBGA binding.
BACKGROUND: Norovirus is a leading cause of acute gastroenteritis (AGE). Noroviruses bind to gut histo-blood group antigens (HBGAs), but only 70%-80% of individuals have a functional copy of the FUT2 ("secretor") gene required for gut HBGA expression; these individuals are known as "secretors." Susceptibility to some noroviruses depends on FUT2 secretor status, but the population impact of this association is not established. METHODS: From December 2011 to November 2012, active AGE surveillance was performed at 6 geographically diverse pediatric sites in the United States. Case patients aged <5 years were recruited from emergency departments and inpatient units; age-matched healthy controls were recruited at well-child visits. Salivary DNA was collected to determine secretor status and genetic ancestry. Stool was tested for norovirus by real-time reverse transcription polymerase chain reaction. Norovirus genotype was then determined by sequencing. RESULTS: Norovirus was detected in 302 of 1465 (21%) AGE cases and 52 of 826 (6%) healthy controls. Norovirus AGE cases were 2.8-fold more likely than norovirus-negative controls to be secretors (P < .001) in a logistic regression model adjusted for ancestry, age, site, and health insurance. Secretors comprised all 155 cases and 21 asymptomatic infections with the most prevalent norovirus, GII.4. Control children of Meso-American ancestry were more likely than children of European or African ancestry to be secretors (96% vs 74%; P < .001). CONCLUSIONS:FUT2 status is associated with norovirus infection and varies by ancestry. GII.4 norovirus exclusively infected secretors. These findings are important to norovirus vaccine trials and design of agents that may block norovirus-HBGA binding.
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