Health authorities across Europe are on high alert due to the rapid spread of the H3N2 influenza variant, one of the most contagious strains of the seasonal flu. The surge in cases has triggered early outbreaks and renewed strain on national healthcare systems.

The Pan American Health Organization (PAHO) warned that the northern hemisphere is experiencing a seasonal rise in respiratory viruses, with H3N2 emerging as the dominant strain. Its high transmissibility has led to atypical and early outbreaks, particularly affecting older adults and vulnerable populations.

The United Kingdom currently reports the highest number of cases in Europe, followed by Spain, where infections have already exceeded last year’s figures.

Germany, France and Italy have also confirmed significant outbreaks, and health experts estimate that the variant is now present in more than 30 European countries.

Beyond Europe, Australia and New Zealand reported H3N2 outbreaks beginning in late winter, while Japan is currently the only Asian country with confirmed active transmission of this strain alongside other influenza subtypes.

In North America, the United States, Canada and Mexico have all reported cases, reinforcing concerns over sustained global spread.

Although Latin America and the Caribbean have not yet confirmed cases of this specific variant, several countries have issued epidemiological alerts to strengthen surveillance, prevention and preparedness efforts.

Common H3N2 flu symptoms include sudden high fever, muscle and joint pain, persistent dry cough, sore throat, nasal congestion and severe fatigue. The virus spreads mainly through respiratory droplets and direct contact with contaminated surfaces.

Health officials emphasize the importance of flu vaccination, proper hygiene and early medical consultation to reduce transmission and prevent severe outcomes.