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Incidence of common respiratory viral infections related to climate factors in hospitalized children in Hong Kong

  • J. W. TANG (a1), F. Y. L. LAI (a2), F. WONG (a1) and K. L. E. HON (a3)
  • DOI:
  • Published online: 27 July 2009

Hong Kong has a subtropical climate and an influenza seasonality lying approximately mid-way (March–June) between those of the Northern (November–March) and Southern (June–September) hemispheres. Respiratory syncytial virus (RSV) shares a similar seasonality to that of influenza in Hong Kong and is another important respiratory infection of childhood. Daily virus incidence data from public hospitals in Hong Kong's New Territory East Cluster, together with Hong Kong climate data were obtained for 2000–2007. Statistical time-series analysis using monthly time windows showed that influenza A and RSV incidence increased with higher environmental relative humidity, whereas influenza B incidence decreased with higher environmental temperatures. The other climate variables (including vapour pressure as a measure of absolute humidity) were not significantly related to the incidence of these respiratory viruses. Data from this study further reinforces the concept that the relationship between climate factors and respiratory virus incidence differ between subtropical/tropical and temperate countries.

Corresponding author
*Author for correspondence: Dr J. W. Tang, Department of Laboratory MedicineNational University Hospital, 5 Lower Kent Ridge Road, Singapore119074. (Email:
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