Doctors warn of quad-demic as infections soar and mask mandates return

A quadruple-whammy of viruses are hitting the US as millions go back to work after the holidays, data shows.

Official figures reveal that infections cause by , Covid, (a respiratory illness that causes the cold) and norovirus (sometimes called the stomach flu) all started to surge over the period, when families gathered to celebrate.

And experts say figures will over the coming weeks as the US heads into the peak period of its annual flu season.

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