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Characterizing Norovirus Transmission from Outbreak Data, United States
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Aug 2020
Source: Emerg Infect Dis. 26(8):1818-1825
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Alternative Title:Emerg Infect Dis
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Description:Norovirus is the leading cause of acute gastroenteritis outbreaks in the United States. We estimated the basic (R|) and effective (R|) reproduction numbers for 7,094 norovirus outbreaks reported to the National Outbreak Reporting System (NORS) during 2009-2017 and used regression models to assess whether transmission varied by outbreak setting. The median R| was 2.75 (interquartile range [IQR] 2.38-3.65), and median R| was 1.29 (IQR 1.12-1.74). Long-term care and assisted living facilities had an R| of 3.35 (95% CI 3.26-3.45), but R| did not differ substantially for outbreaks in other settings, except for outbreaks in schools, colleges, and universities, which had an R| of 2.92 (95% CI 2.82-3.03). Seasonally, R| was lowest (3.11 [95% CI 2.97-3.25]) in summer and peaked in fall and winter. Overall, we saw little variability in transmission across different outbreaks settings in the United States.
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Pubmed ID:32687043
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Pubmed Central ID:PMC7392428
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