CHP strongly urges public to promptly receive seasonal influenza vaccination as three severe paediatric influenza infection cases were recorded this week
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The case involves a 14-year-old boy with good past health. He developed cough and headache on November 18, followed by a fever yesterday (November 19). He was brought to the Accident and Emergency Department of Tseung Kwan O Hospital today. Due to hypotension, he was transferred to the paediatric intensive care unit of United Christian Hospital. He is hosptialised and currently in serious condition. His nasopharyngeal swab specimen tested positive for influenza A (H3) virus upon laboratory testing. The clinical diagnosis was influenza A infection complicated with shock.
The boy had not yet received the 2025/26 SIV and had no recent travel history. Two of his household contacts developed mild respiratory symptoms recently, but did not require hospitalisation and have recovered. No influenza outbreaks have been reported at his school recently.
Including the abovementioned case, there have been 21 severe influenza cases involving children so far this summer influenza season, including two fatal cases. The affected children aged 11 months to 17 years. A total of 12 cases have been recorded since the launch of this year's SIV Programmes, with only one having received this year's SIV four days prior to the onset of illness. As it generally takes two weeks for the body to develop sufficient protection after vaccination, in other words, these severe influenza cases are not protected by the vaccine.
"According to the latest surveillance data, influenza activity began to decline in the last week of October. However, it remains at a relatively high level. As the weather turns cooler, influenza activity may still fluctuate. Moreover, a winter influenza season may occur early next year. Therefore, I once again urge all persons aged 6 months or above, except those with known contraindications, who have not yet received the SIV to do so promptly. Compared to the winter influenza season earlier this year, there have been more severe paediatric influenza infection cases this season. Currently, among children aged below 18 years, the coverage rate of children aged 6 months to under 2 years is relatively low, at nearly 16 per cent only. Parents should not hesitate and should contact their family doctors as soon as possible to arrange for their children, as well as themselves and other family members, to receive the SIV," the Controller of the CHP, Dr Edwin Tsui, said.
He also reminded members of the public that, especially children, the elderly and those with underlying illnesses, should seek medical advice promptly if they present with fever and respiratory symptoms for early treatment. As children with influenza can deteriorate rapidly, parents must pay close attention to their children's condition. They should go to an Accident and Emergency Department immediately if the child's condition deteriorates, for example, if they develop symptoms such as shortness of breath, wheezing, blue lips, chest pain, confusion, a persistent fever or convulsions.
Separately, high-risk individuals should wear surgical masks when staying in crowded places. People with respiratory symptoms, even if mild, should wear a surgical mask and seek medical advice promptly. They should also consider whether to attend work or school.
In addition to issuing timely reminders to healthcare professionals and schools based on the latest seasonal influenza development, the CHP also uploads the latest seasonal influenza information on its website weekly. Members of the public can visit the CHP's seasonal influenza and COVID-19 & Flu Express webpages.
Ends/Thursday, November 20, 2025
Issued at HKT 20:00
Issued at HKT 20:00
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