"Chilblain-like inflammation causes redness on hands and feet and can last for months."

They found one mechanism behind both types of the condition involved the body generating an immune response with high levels of certain autoantibodies, which mistakenly target and react with a person’s own cells and tissues as well as the invading virus. They also found an overlap with type I interferon, a key protein in the antiviral response.

The symptom results in chilblain-like inflammation and redness on the hands and feet, with the condition sometimes lasting for months at a time. It typically develops within a week to four weeks of being infected and can result in toes and fingers becoming swollen or changing colour.

They found one mechanism behind both types of the condition involved the body generating an immune response with high levels of certain autoantibodies, which mistakenly target and react with a person’s own cells and tissues as well as the invading virus. They also found an overlap with type I interferon, a key protein in the antiviral response.