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Little is known about global variation in early epidemic growth rates and effective reproduction numbers (R ) of seasonal influenza. We aimed to estimate global variation in R of influenza type A and B during a single period. Country influenza detection time series from September 2017 through January 2019 were obtained from an international database. Type A and B epidemics by country were selected on the basis of R estimates for a five-week moving window, advanced by week. Associations of R with absolute latitude, human development index