In a context of increasing spread of the K variant of the H3N2 virus, virology specialist Mahjoub Aouni launched, on Saturday December 20, 2025, a clear appeal to vulnerable populations to be vaccinated against seasonal flu. Addressing particularly the elderly, people suffering from chronic illnesses and those whose health is fragile, he insisted on the importance of the vaccine to limit the spread of this new strain.
A more contagious variant, but known
In his statement to the Tap press agency, Mahjoub Aouni specified that “ this strain is not new, but results from annual mutations and changes to the original strain, making it faster to spread and more contagious, while retaining the usual characteristics of the flu virus “. He wanted to reassure that these mutations are closely monitored by international health authorities and integrated into seasonal vaccines.
The virologist recalled that the World Health Organization (WHO) systematically takes these variants into account when determining the composition of annual vaccines. “ This year’s seasonal flu vaccine includes antibodies against the new K strain, as well as the A virus (H1N1 and H3N2) and the seasonal B virus “, he added.
Origin and spread of the K variant
The K variant, from the H3N2 virus, was first identified in Australia in August 2025. Since then, it has spread to more than thirty countries, causing concern among public health experts. Mahjoub Aouni insisted that “ compliance with preventive measures and vaccination remain essential », emphasizing that the time is still good to get vaccinated before reaching the peak of infections expected for January 2026.
Increased vigilance during the holidays
The specialist warned that no country can, to date, completely limit the spread of this variant, especially with the approach of end-of-year holidays, celebrations and school holidays. He therefore recommended that pregnant women, children and vulnerable people be vaccinated and maintain the usual hygiene measures: social distancing, wearing a mask, regular hand washing and ventilation of enclosed spaces.
This warning comes in a context where seasonal influenza, traditionally underestimated, can have serious consequences for populations at risk, especially when it is accentuated by the emergence of more contagious variants. Vaccination remains the most effective way to reduce transmission and prevent severe forms of the disease.
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