As winter 2025 sets in across the northern hemisphere, respiratory infections typically spike—and this year is no exception. While flu levels remained low in many regions, recent data show an unusual early surge in countries like Japan and the UK.
From Nov 17 to 23, 2025, the Ministry of Health, Labor, and Welfare of Japan reported 196,900 flu cases, marking a start nearly a month ahead of last winter. The UK, too, has seen an early wave that experts describe as unusually severe.
Globally, Influenza A (H3N2) currently dominates. According to the weekly report by the Chinese Center for Disease Control and Prevention (China CDC), H3N2 is also the leading strain in China. All detected pathogens are common seasonal viruses, with no novel threats identified.
Wang Dayan, research fellow at the National Institute for Viral Disease Control and Prevention under China CDC, explains that dominant strains can shift within a season—alternating between subtypes like H1N1, H3N2, or Influenza B. China CDC research fellow Peng Zhibin adds that antigenic drift—minor mutations in flu viruses—drives annual outbreaks but doesn’t mean the virus is growing stronger.
Clusters of flu outbreaks are rising in childcare facilities and schools, with the 5-14 age group showing higher positivity rates. Experts predict that flu activity will continue climbing through winter 2025-26.
Here’s how to navigate the season with confidence:
- Get Vaccinated Now: Flu shots are your first line of defense. Check availability and get vaccinated early to match the dominant H3N2 strain.
- Practice Smart Hygiene: Wash hands frequently, use alcohol-based sanitizer, and clean high-touch surfaces.
- Improve Ventilation: Open windows or use air purifiers in shared spaces to reduce virus particles.
- Monitor Symptoms: If you feel feverish or fatigued, rest at home, consider a rapid flu test, and seek telemedicine support if needed.
- Plan Travel Carefully: Check local flu activity before trips, pack masks and sanitizer, and adjust itineraries if outbreak clusters emerge.
By combining expert insights with proactive measures, you can stay healthy and keep moving—whether you’re commuting to work, hitting the gym, or exploring a new city this winter.
Reference(s):
cgtn.com
