Experts say this could be the worst flu season for a decade - here's why

Experts are warning that this year's flu season could be the worst in a decade due to a mutated seasonal flu virus that has appeared to evade immunity and kick-started an early and potentially severe flu season. The mutation in the H3N2 strain of influenza emerged unexpectedly in the summer, causing concerns about its ability to spread rapidly and infect people more easily. As a result, health officials are urging people to get vaccinated to mitigate the impact of what could be a challenging flu season, especially for older and vulnerable populations.