Estimated incidence and number of outpatient visits for seasonal influenza in 2015-2016 in Beijing, China
Wu, S.; van Asten, L.; Wang, L.; McDonald, Scott A; Pan, C.Y.; Duan, W; Zhang, L; Sun, Y.; Zhang, Y.; Zhang, X; Pilot, E; Krafft, T; Hoek, Hans W.; VAN DER Sande, M A B; Yang, P.; Wang, Q.
(2017) Epidemiology and Infection, volume 145, issue 16, pp. 3334 - 3344
(Article)
Abstract
Information on morbidity burden of seasonal influenza in China is limited. A multiplier model was used to estimate the incidence and number of outpatient visits for seasonal influenza by age group for the 2015-2016 season in Beijing, the capital of China, based on reported numbers of influenza-like illness consultations and
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proportions of positive cases from influenza surveillance systems in Beijing, general consultation rates and other parameters from previous studies, surveys and surveillance systems. An estimated total of 1 190 200 (95% confidence interval (CI) 830 400-1 549 900) cases of influenza virus infections occurred in Beijing, 2015-2016 season, with an attack rate of 5·5% (95% CI 3·9-7·2%). These infections resulted in an estimated 468 280 (95% CI 70 700-606 800) outpatient visits, with an attack rate of 2·2% (95% CI 0·3-2·8%). The attack rate of influenza virus infections was highest among children aged 0-4 years (31·9% (95% CI 21·9-41·9%)), followed by children aged 5-14 years (18·7% (95% CI 12·9-24·5%)). Our study demonstrated a substantial influenza-related morbidity in Beijing, China, especially among the preschool- and school-aged children. This suggests that development or modification of seasonal influenza targeted vaccination strategies need to recognize that incidence is highest in children.
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Keywords: Adolescent, Adult, Ambulatory Care, Beijing, Child, Child, Preschool, Cross-Sectional Studies, Humans, Incidence, Infant, Infant, Newborn, Influenza, Human, Journal Article, Middle Aged, Sentinel Surveillance, Young Adult
ISSN: 0950-2688
Publisher: Cambridge University Press
Note: Publisher Copyright: © 2017 Cambridge University Press.
(Peer reviewed)