Abstract
The first wave of the novel influenza virus A(H1N1)pdm09 in the subtropical city Hong Kong coincided with the summer epidemics of seasonal influenza and other common respiratory viruses. We hypothesize that this virus could have interfered the regular seasonality of other respiratory viruses.
Highlights
The first wave of the novel influenza virus A(H1N1) pdm09 in the subtropical city Hong Kong coincided with the summer epidemics of seasonal influenza and other common respiratory viruses
Weekly age-specific numbers of positive specimens for influenza A(H1N1)pdm09, seasonal A(H1N1), A(H3N2), influenza B, respiratory syncytial virus (RSV), adenovirus and parainfluenza were aggregated into the age groups of 0–4, 5–17, 18–64, and 65+ years during 2004 to 2013
Positive proportions of viruses other than A(H1N1)pdm09 markedly decreased in all the age groups during the first pandemic wave
Summary
The first wave of the novel influenza virus A(H1N1) pdm in the subtropical city Hong Kong coincided with the summer epidemics of seasonal influenza and other common respiratory viruses. We hypothesize that this virus could have interfered the regular seasonality of other respiratory viruses. As compared to the pre-pandemic period, the delayed peaks during the post-pandemic period were observed in A (H3N2) in all age groups and RSV of the 0-4 age group. Influenza B, adenovirus and parainfluenza showed slightly earlier winter and summer peaks in most age groups
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