The coronavirus that has exploded into a pandemic has almost certainly been circulating for several months longer than public health experts first suspected, masked by asymptomatic cases or illnesses incorrectly diagnosed.
https://thehill.com/homenews/496293-new-discoveries-shift-coronavirus-timeline-by-months
https://thehill.com/homenews/496293-new-discoveries-shift-coronavirus-timeline-by-months
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