Taking a COVID-19 test at home seems simple enough: If you get a line, you're positive for the coronavirus. But what if your results aren't so obvious? For instance, if you only get a very faint line ...

In 2024, rapid COVID tests are a staple of cough-and-cold aisles across America. But the convenience of self-testing comes with a caveat: The onus is on you to report your results. Swab, swirl, squirt ...

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