It started as a regular cold. The stuffy nose cleared up days ago, but the cough stayed behind, and now it wakes you at 3 a.m., rattles around your chest during the morning commute, and gets a worried look from your kids every time you hack into your sleeve. At some point most of us type a grim question into a search bar late at night. Let's answer it plainly, then get to the part that matters more: what to watch for, and how to keep the rest of the house from going down with you.
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