The Best Way to Fight the Flu

The video explains the concept of flu season, which occurs twice a year due to the opposite winters in the Northern and Southern Hemispheres. It discusses how the flu virus spreads more easily in cold, dry conditions and why a new vaccine is needed each year due to the virus's rapid mutation. The video also covers the process of selecting flu strains for vaccines, which involves global data collection and predictions by the World Health Organization. Despite efforts, vaccines may not always match circulating strains due to changes during production.

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