Experts say China is likely to see an explosion of Covid-19 cases in the coming weeks as very few people there have been affected by the virus leading to low natural immunity. NBC News’ Janis Mackey Frayer has the story…
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More than half of adults in the U.S. have had at least one dose of a Covid-19 vaccine, but health experts warn that vaccine hesitancy is slowing down the chances of reaching herd immunity. Epidemiologist at the University of Pennsylvania…