The National Institutes of Health has announced the first phase of its four-year, billion-dollar initiative to learn more about why some Covid-19 survivors have long-term symptoms, even after the virus has left the body.

The group of patients is known as the “long-haulers,” though the NIH is calling the condition “Post-Acute Sequelae of SARS-CoV-2 infection,” or PASC. (The word “sequelae” comes from Latin, meaning a condition that occurs following a disease. The word “sequel” has the same origin.)

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The NIH research aims to learn how SARS-CoV-2, the virus that causes Covid-19, could possibly lead to lasting symptoms, such as profound fatigue, brain fog, headaches, fevers and shortness of breath.

The symptoms “can range from mildly annoying to actually

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