According to the latest figures, between 10 and 30 percent of all persons who test positive for SARS-CoV-2 go on to develop long-term symptoms that can last for weeks, months or potentially even years.

These can vary greatly depending on the severity of the disease, the age of the patient and his or her medical history. When – or indeed whether – those who suffer so‑called “Long Covid” can expect their symptoms to clear up is unclear, and there is as is as yet no treatment for the condition that does more than just alleviate symptoms.

A U.S.-based research group has now identified four factors that significantly increase the risk of Long Covid.