A pharmacist handles a syringe for the flu vaccine in October of 2017 in France.
Mandatory Credit: Georges Gobet/AFP/AFP via Getty Images
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Australia's tough flu season could spell trouble for the US this winter, especially with Covid-19 in the mix
Influenza is always unpredictable. Infectious disease experts like to hedge their forecasts with a caution: When you've seen one flu season, you've seen one flu season.
