Why has my cold dragged on so long? And how do I know when it's morphed into something more serious?
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Common Cold Stages: How Long They Last
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Here's Why Your Cold Is Still Around | Weather.com
People may suffer 'long colds' more than four weeks after infection, study shows | Medical research | The Guardian
Stages of the Common Cold: Your Day-by-Day Guide
How Long Does The Common Cold Last? When To Tell If It's Normal Or Not? - LifeHack
Colds in adults
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How long does a cold last? Duration and when to see a doctor
How long does a cold last? Duration and when to see a doctor
Common Cold | Antibiotic Use | CDC
