ResearcheRs at Yale University in the US have finally found an answer to why a cold often leads to the flu. When a nose cools down in lower temperatures, the immune system's ability to stop the virus from spreading decreases. It has long been known that the most typical cause of mucous illness, rhinovirus, increases more quickly in a cold nose than in the warmth of the lungs, but it hasn't been known why.
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Study: Flu virus thrives in a cold nose
Most studies have focused on determining the effect of cold air directly on the virus. Now, however, researchers have changed course and given attention to the nose's immunology.