Source: Hong Kong Government special administrative region
The Centre for Health Protection (CHP) of the Department of Health (DH) today (January 8) announced that the summer influenza season has concluded. Seasonal influenza activity has continued to decline in the past few weeks and dropped below the baseline levels during the most recent week. However, influenza activity may rise again as the weather gradually turns colder. With the winter influenza season approaching, the CHP strongly urged those who have not yet received the 2025/26 seasonal influenza vaccination (SIV), particularly high-risk groups such as pregnant women, the elderly, children and those with chronic illnesses. These groups should receive their SIV promptly to reduce the risk of severe illness and death from infection.
Summer influenza season concludes and winter influenza season approaches
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“Hong Kong entered the summer influenza season in early September last year. Seasonal influenza activity peaked in mid-to-late October last year and has since been gradually declining. The latest surveillance data shows that the percentage of respiratory specimens tested positive for seasonal influenza viruses during the most recent week (December 28, 2025, to January 3, 2026) was 4.08 per cent, while the influenza admission rate in public hospitals was 0.23 cases per 10 000 population. As both indicators have dropped below the baseline levels (i.e. 4.94 per cent and 0.27 cases per 10 000 population respectively), the CHP confirmed that the summer influenza season has ended. Hong Kong entered the summer influenza season in September last year and it has lasted about four months. The summer influenza season started later than usual,” the Controller of the CHP, Dr Edwin Tsui, said.
“This summer influenza season has ended, meaning there was no overlap between the summer and winter influenza seasons. However, influenza activity may rise again as the weather gradually turns colder in the first quarter of this year and it cannot be ruled out that the circulating virus strains may change as the winter influenza season approaches. Therefore, I once again urge all individuals aged 6 months or older, except those with known contraindications, to act promptly if they have not yet received an SIV. This includes those who contracted influenza during the summer influenza season in order to guard against other circulating virus strains that may emerge during the upcoming winter influenza season. Furthermore, although there are some antigenic differences between the currently circulating influenza A (H3) virus strain and the virus strain contained in the vaccine, an SIV can still offer protection against the variant strain of subclade K, as well as the influenza A (H1) and influenza B strains included in the vaccine,” Dr Tsui said.
2025/26 SIV Programmes
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“Although the influenza activity has declined to below the baseline level at the moment, sporadic outbreaks caused by influenza viruses are still possible in schools and residential care homes. For children who did not join the SIV School Outreach Programme, parents should promptly bring their children to private doctors
Members of the public may refer to the CHP’s COVID-19 & Flu Express