The cold weather itself does not cause the respiratory disease, COVID-19, but
there are factors due to the weather that increase the odds of contracting the
disease.
The virus can survive longer in the cold, dry air with lower humidity. These are
the conditions that most geographical areas experience in the winter months.
People tend to stay indoors more often in the colder weather and are in closer
proximity to one another.
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https://www.medpagetoday.com/infectiousdisease/covid19/89495