Mutant Flu Strain Sparks ‘Flu Jab SOS’ as Experts Warn of Worst Season in a Decade
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A concerning new strain of influenza, mutated over the summer, is triggering an early and potentially severe flu season, prompting health officials to issue urgent calls for vaccination.Leading experts are voicing concerns that this year’s flu could be the worst in a decade, fueled by a virus that appears to evade existing immunity.
A Summer Mutation, A Winter Threat
Scientists continuously monitor influenza viruses due to their constant evolution, necessitating annual updates to the seasonal flu vaccine. This evolution typically occurs in a predictable pattern of “shift and drift,” with minor changes occurring frequently and more ample mutations – known as “shifts” – happening less ofen. Though, a meaningful shift occurred in June, with seven mutations appearing in a strain of H3N2 seasonal flu.
“We haven’t seen a virus like this for a while, these dynamics are unusual,” stated a senior researcher at the World Influenza Center at the Francis Crick Institute. “It does concern me, absolutely,” they added, “I’m not panicking, but I am worried.”
Early Uptick and Increased Transmissibility
The mutated H3N2 strain emerged unexpectedly outside of the typical flu season, in the middle of the northern hemisphere’s summer. According to experts, the virus is poised to spread rapidly as temperatures drop and people spend more time indoors. The virus is currently spreading rapidly among children, a key factor in its dissemination. Typically, around one in five people are infected with the flu each season, but this number could be significantly higher this year. While predictions remain uncertain, observations from Australia – which experienced its worst flu season on record this year – offer a cautionary tale. However,the level of immunity varies greatly between age groups,with older individuals potentially more vulnerable due to a lifetime of exposure to different flu strains.
‘A Nastier Virus’ and Historical Precedent
The current strain is particularly concerning due to its lineage. Experts emphasize that H3N2 influenza is historically a more severe form of the virus, especially for older populations. “H3 is always a hotter virus, it’s a nastier virus, it’s more impactful on the population,” explained a senior official.
The potential for serious illness is underscored by recent mortality figures: nearly 8,000 people died from flu last year, and nearly 16,000 in the 2022-23 flu season. The National Health Service (NHS) is bracing for a challenging winter.
Vaccination Remains Key, Despite Imperfect Match
The primary advice from health officials is to get vaccinated against the flu. The NHS in England has issued a “flu jab SOS,” reporting 2.4 million vaccine slots available in the coming week. A leading researcher argues that this is “absolutely the most vital year” to get vaccinated, urging individuals to schedule their appointments promptly.
Though, this year’s vaccine is not a perfect match for the mutated virus.The vaccine’s composition was finalized in february, before the emergence of the new strain in june. “Some protection is better than no protection, but this year is likely to be one of the years where the amount of protection is less than it is in years when the match is better, it’s not an ideal situation,” cautioned a researcher at the University of Oxford.
While the vaccine may not prevent infection entirely, it is expected to lessen the severity of illness. Doctors have also been advised to consider early antiviral treatment to reduce the risk of complications. In Japan, schools have temporarily closed to help contain outbreaks, employing measures similar to those used during the COVID-19 pandemic.
Despite the concerning outlook, experts acknowledge the inherent uncertainty of predicting the future course of the virus. “It might all go away by next week,” said a senior researcher, “but I don’t think it will.”
