The coronavirus has been spreading worldwide for over seven months now, and more than 18 million people are known to have been infected by it. Over that time, we’ve come to understand that, in most people, the virus causes mild symptoms or none at all -- at least at the time they have the virus. But even asymptomatic patients may suffer lingering effects. Jason Gale reports that it may contribute to the pandemic’s significant, long-term social and economic costs.

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