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Green, Yellow, and Brown Phlegm: What Does it Mean?
Is it a sinus infection or COVID-19?
Christie A Barnes, MD Nebraska Medicine Omaha, NE
Don't judge your mucus by its color - Harvard Health
COVID-19 symptoms are reduced by targeted hydration of the nose, larynx and trachea
Sinus or Allergies or COVID: Here's the Difference
Advancing Health Search Nebraska Medicine Omaha, NE
Advancing Health Search Nebraska Medicine Omaha, NE
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Runny nose and COVID: Link, alternative diagnosis, and more
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Eye Discharge: Causes, Types and Treatment