The new coronavirus seems to slice heart muscle fibers into small, precisely sized fragments — at least when it infects heart cells in a lab dish, a new study reveals.

This snipping of muscle fibers, which could permanently damage heart cells, is scary enough in a lab dish; but the researchers found evidence that a similar process could be happening in the hearts of COVID-19 patients as well. However, the new finding, which was published to the preprint database bioRXiv on Aug. 25, has not yet been published in a peer-reviewed journal, or proven to happen in people.

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