Colombia Detects First H3N2 K Subclade Case Following Global Alerts

Building on international alerts, Colombia's Ministry of Health confirmed the first case of influenza A(H3N2) subclade K in a traveler with mild symptoms. Officials are monitoring this seasonal variant, with pediatric experts urging enhanced prevention amid peak transmission risks for children.

Colombia's Ministry of Health and Social Protection announced the first confirmed case of influenza A(H3N2) subclade K, detected via molecular tests by the National Institute of Health (INS). The patient presented mild respiratory symptoms and recent international travel history, consistent with patterns seen in global spread reported earlier in Europe, the US, and Latin American surveillance.

Authorities are tracking influenza A subtypes like A(H1N1)pdm09 and A(H3N2), which peak seasonally between May-June and September-November. This detection follows broader alerts on the K subclade's circulation abroad.

Dr. Catalina Vásquez, Pediatric Pulmonology coordinator at Hospital Infantil Universitario de San José in Cali, highlights risks for children under three and those with chronic conditions like asthma or diabetes. 'Infections can progress to severe pneumonia, especially in young children,' she warns, advising prompt care for symptoms such as breathing difficulty, persistent fever, or lethargy.

Recommendations include annual vaccination for children under three, seniors over 60, pregnant women, chronically ill individuals, and healthcare workers, alongside handwashing, ventilation, and breastfeeding. 'Timely prevention is key during peak seasons,' Dr. Vásquez emphasizes.

This case reinforces the need for vigilance to curb complications in vulnerable groups.

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Realistic illustration of Indonesian doctors treating super flu patients in a Bandung hospital, with Java map highlighting affected areas, conveying controlled outbreak.
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Super flu cases detected in Central and West Java

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Central Java's Health Department detected one case of super flu, or influenza A H3N2 subclade K, in Semarang at the end of December 2025. Meanwhile, Hasan Sadikin Hospital in Bandung confirmed 10 cases in West Java from August to November 2025, with one patient dying due to comorbidities. Health officials stress that this is not a new virus and the situation is under control.

A mutation of the influenza A virus, known as the H3N2 K subclade, has led to increased hospitalizations in Europe and the United States, though no more severe cases are reported. In Latin America, including Mexico, preventive surveillance is in place without this variant predominating. Authorities recommend vaccination for vulnerable groups amid the risk of spread.

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Chile's Ministry of Health, through the Public Health Institute, confirmed the detection of the first cases of influenza A (H3N2) sub-clade K, known as “supergripe”, in analyzed samples in the country. This finding was expected given the virus's global behavior, already detected in Brazil and Peru. Health Minister Ximena Aguilera clarified that it is not a new virus or a pandemic.

Influenza has truly arrived in Sweden. In the first week of the year, 2,131 cases were confirmed, a 22 percent increase from the end of the previous week. The spread is assessed as medium-high level, according to the Public Health Agency.

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The United States managed to curb a bird flu outbreak in 2025 after its first known human death from the virus, ending the public health emergency response by July. Despite progress, experts warn that the H5N1 strain remains a threat to animals and could still pose risks to humans. Efforts focused on testing, vaccination research, and biosecurity measures helped reduce cases in livestock and people.

Hong Kong is approaching the winter flu season, but vaccination rates among most age groups remain below the 70 per cent threshold needed for herd immunity, a leading government medical adviser has warned. David Hui Shu-cheong on Saturday reminded the public to get vaccinated ahead of Lunar New Year, when social gatherings are frequent.

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A nasal spray delivering a broad-spectrum antibody has demonstrated potential to prevent infections from any flu strain in animal and preliminary human studies. Developed initially by Johnson & Johnson and now advanced by Leyden Labs, the spray could offer rapid protection during pandemics. Experts see it as a valuable tool for high-risk groups, though further testing is needed.

 

 

 

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