On-off social distancing may be needed until 2022

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People stand in a line maintaining social distancing to receive meals at a Buddhist temple in Bangkok on Tuesday. (AP pic)WASHINGTON: A one-time lockdown won’t halt the novel coronavirus and repeated periods of social distancing may be required into 2022 to prevent hospitals from being overwhelmed, Harvard scientists who modelled the pandemic’s trajectory said Tuesday. Their study comes as the US enters the peak of its Covid-19 caseload and states eye an eventual easing of tough lockdown measures. The Harvard team’s computer simulation, which was published in a paper in the journal Science, assumed that Covid-19 will become seasonal, like closely related coronaviruses that cause the common cold, with higher transmission rates in colder months. But much remains unknown, including the level of immunity acquired by previous infection and how long it lasts, the authors said. “We found…