MRNA is known to most people from high school science classes or for its use in Covid-19 vaccines.
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EDITOR’S NOTE:  This story was reported in collaboration with the Global Health Reporting Center with support from the Pulitzer Center.

Vita Sara Blechner’s life changed on a Saturday afternoon. The middle school librarian was home in Oceanside, New York, when she felt shooting pains in her back. After an acid reflux pill couldn’t soothe the fiery feeling, her husband suggested a trip to the emergency room.