A team of scientists is proposing a new explanation for some cases of long COVID, based on their findings that serotonin levels were lower in people with the complex condition.

In their study, published in the journal Cell, researchers at the University of Pennsylvania suggest that serotonin reduction is triggered by remnants of the virus lingering in the gut. Depleted serotonin could especially explain memory problems and some neurological and cognitive symptoms of long COVID, they say.

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This is one of several new studies documenting distinct biological changes in the bodies of people with long COVID — offering important discoveries for a condition that takes many forms and often does not register on standard diagnostic tools such as X-rays.

Continue here: The New York Times