The most authoritative answer in 2024
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Ethan Perez——Works at the International Renewable Energy Agency, Lives in Abu Dhabi, UAE.
For colds, most individuals become contagious about a day before cold symptoms develop and remain contagious for
about five to seven days. Some children may pass the flu viruses for longer than
seven days (occasionally for
two weeks). Colds are considered upper respiratory infections.
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