Background It has been difficult to define the burden of influenzain children because of confounding by the cocirculation of respiratorysyncytial virus (RSV). In Hong Kong, China, the influenza andRSV infection seasons sometimes do not overlap, thus providingan opportunity to estimate the rate of influenza-related hospitalizationin a defined population, free from the effects of RSV.
Methods In a retrospective, population-based study, we estimatedthe influenza-associated excess rate of hospitalization amongchildren 15 years old or younger in the Hong Kong Special AdministrativeRegion from 1997 to 1999. Data from a single hospital with intensiveuse of virologic analyses for diagnosis were obtained to defineand adjust for underestimation of the model.
Results Peaks of influenza and RSV infection activity were wellseparated in 1998 and 1999 but overlapped in 1997. The adjustedrates of excess hospitalization for acute respiratory diseasethat were attributable to influenza were 278.5 and 288.2 per10,000 children less than 1 year of age in 1998 and 1999, respectively;218.4 and 209.3 per 10,000 children 1 to less than 2 years ofage; 125.6 and 77.3 per 10,000 children 2 to less than 5 yearsof age; 57.3 and 20.9 per 10,000 children 5 to less than 10years of age; and 16.4 and 8.1 per 10,000 children 10 to 15years of age.
Conclusions In the subtropics, influenza is an important causeof hospitalization among children, with rates exceeding thosereported for temperate regions.
Source Information
From the Departments of Pediatrics and Adolescent Medicine (S.S.C., Y.L.L., W.H.S.W.) and Microbiology (K.H.C., J.S.M.P.), University of Hong Kong, Hong Kong, China.
Address reprint requests to Dr. Peiris at the Department of Microbiology, University Pathology Bldg., Queen Mary Hospital, Pokfulam, Hong Kong Special Administrative Region, China, or at malik{at}hkucc.hku.hk.
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