Health experts are warning the nation to brace for what could be an exceptionally severe flu season this fall and winter, as more people who have not built up immunity over the last few years mix and mingle. There are two big reasons why more people could be vulnerable to the flu this year.

The first is that with coronavirus restrictions such as the wearing of masks all but forgotten, people are more likely to come into contact with the flu virus this year than over the last two years.

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