Illustration of a crowded Swedish hospital amid flu surge, with rising case stats displayed.
Illustration of a crowded Swedish hospital amid flu surge, with rising case stats displayed.
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Number of influenza cases surges in Sweden

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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.

Influenza has reached a peak level similar to last season's high, reports the Public Health Agency of Sweden. The number of confirmed cases has risen sharply, with 2,131 cases noted in the first week of the year. This marks a 22 percent increase from the last week of the previous year.

The spread is classified as medium-high on the agency's website. Nearly all cases involve influenza A, dominated by the H3N2 virus. The agency warns that the infection is expected to continue burdening healthcare.

Last week, 24 people with confirmed influenza were admitted to intensive care units, a decrease from 28 the week before. Preliminary figures show that 39 people died from influenza last week, compared to 51 the previous week.

These numbers highlight the ongoing impact of influenza on Sweden's healthcare system, though some indicators like ICU admissions and deaths show a slight relief from the prior week.

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X users discuss an early surge in influenza A cases in Sweden, nearing last season's peak eight weeks ahead of schedule. Some note the strain is more contagious due to post-vaccine developments, with personal accounts of illness. Conversations highlight higher flu-related deaths than COVID, ongoing regional increases, and suggestions for preventive measures like masks amid healthcare pressures.

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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.

Flu cases in Sweden have doubled every week since mid-November, driven by the new K variant of the influenza virus. The Public Health Agency reports a rapid increase, with cases rising from 403 to 808 in one week. Severe cases, including deaths and intensive care admissions, have also risen from low levels.

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Public Health Agency warns that norovirus is now spreading in Sweden, with more cases than at the same time last year. The outbreak is expected to increase in the coming weeks, and effects are already visible in schools like Götetorpsskolan on Hammarö.

Building on recent surges in Europe and the US, the World Health Organization has issued a formal alert for the 2025-2026 flu season due to the rapid global spread of influenza A(H3N2) subclade K (J.2.4.1) since August 2025. While not more severe, its advance prompts preparations in the Northern Hemisphere and anticipation in the Southern Hemisphere, including Brazil.

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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.

Sweden is experiencing an unusually cold February due to a high-pressure system trapping cold air. Climate expert Martin Hedberg suggests a possible link to global warming altering weather patterns. Milder weather is now moving in, with temperatures potentially rising above freezing in some areas.

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TBE cases in Sweden have tripled over ten years despite rising vaccinations. Åke Lundkvist, professor of virology at Uppsala University, suspects the virus may have changed, reducing vaccine effectiveness. Researchers are now analyzing 12,000 ticks to investigate.

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