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Does yellow mucus mean you need antibiotics? What phlegm can—and can't—say about your health

When you're sick you'll often produce more phlegm, and might notice it's thicker or a different color: white, green, yellow or maybe even brown. Subscribe to our newsletter for the latest sci-tech ...

Human 'mini-noses' help explain why RSV infections are more severe in children than in adults

An infection with respiratory syncytial virus (RSV) typically affects infants much harder than adults. While adults usually ...