CHP urges public to promptly receive seasonal influenza vaccination as another severe paediatric influenza infection case reported
The Centre for Health Protection (CHP) of the Department of Health (DH) today (November 27) recorded another severe paediatric influenza infection case. The CHP urged parents to arrange for their children to receive free seasonal influenza vaccination (SIV) promptly, as it is one of the most effective ways to prevent seasonal influenza and its complications. Vaccination also reduces the risk of serious illness or death from infection.
The case involves a 2-year-old girl with good past health. She developed a fever, vomiting and loose stool since November 25. She was brought to the Accident and Emergency Department of United Christian Hospital yesterday (November 26) and was admitted. Due to shock and deterioration of general condition, she was transferred to the paediatric intensive care unit of the hospital, and is being arranged to transfer to Hong Kong Children's Hospital for further treatment. She is currently in critical condition. Her nasopharyngeal swab specimen tested positive for influenza A (H3) virus upon laboratory testing. The clinical diagnosis was influenza A infection complicated with shock, encepathopathy and multi-organ failure.
The girl had not yet received the 2025/26 SIV and had no travel history during the incubation period. One of her household contacts developed mild respiratory symptoms recently, but did not require hospitalisation and has recovered.
Including the abovementioned case, there have been 22 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 13 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 has gradually declined since late October. However, it remains above the baseline thresholds. 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 17 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.
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