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Coronavirus (booster) FAQ: Can it cause a positive test? When should you get it?

There is a lot of information about coronavirus vaccines out there, and some of it seems vague or contradictory. We talked to experts to help answer some of the most common and confusing questions.
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We regularly answer frequently asked questions about life during the coronavirus crisis. If you have a question you'd like us to consider for a future post, email us at goatsandsoda@npr.org with the subject line: "Weekly Coronavirus Questions." See an archive of our FAQs here.

A few weeks ago, my friend Ashley was preparing to take her final examinations for her Ph.D. and trying to take all the right precautions so that the exams would go smoothly.

"It was a Thursday afternoon. I had gotten the bivalent vaccine and the flu shot," she said. "Then the next day I started feeling bad."

At first, she attributed her symptoms to the effects of the COVIDvaccine. But after a few days, she describes having a moment of uncertainty about the cause of

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