The increasingly lethal turn has filled hospitals, complicated the start of the school year, delayed the return to offices and demoralised healthcare workers.
Most of CNN's offices are already open on a voluntary basis, and more than a third of news staff members have returned.
The study, published by the CDC on Friday, focused on 469 Covid-19 cases identified among Massachusetts residents who had travelled to Barnstable County, a summer vacation destination, during July 3 to 17, the Xinhua news agency reported.
With no fans and athletes confined to a quasi-bubble, under threat of deportation, the on-the-ground energy of most Olympics Games is completely absent at Tokyo
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