The first US case of coronavirus reinfection has been confirmed with genetic sequencing, raising concerns that an initial bout of illness may confer only short-lived protection against the disease.

The 25-year old man, whose second encounter with Covid-19 was more severe, also raises questions whether — at least in some people — the virus might diminish the immune system’s capacity to fend off future encounters with the illness.

BL Premium

This article is reserved for our subscribers.

A subscription helps you enjoy the best of our business content every day along with benefits such as exclusive Financial Times articles, ProfileData financial data, and digital access to the Sunday Times and Sunday Times Daily.

Already subscribed? Simply sign in below.

Questions or problems? Email or call 0860 52 52 00. Got a subscription voucher? Redeem it now