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flag Cooler winter conditions boost spread of flu and SARS-CoV-2, despite not directly causing illness.

flag Cold and wet weather does not directly cause illnesses, but cooler temperatures and dry winter air can increase the spread of respiratory viruses like the flu and SARS-CoV-2. flag Shorter daylight and indoor allergens can also lower immunity. flag Experts recommend vaccinations, masking, and using scarves to humidify airways to protect against these illnesses.

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