When the US Centers for Disease Control and Prevention recently reported that almost 8% of the millions who have received the first dose of a Covid-19 vaccine hadn't returned to get the second shot they need, it raised concerns that the country might not be able reach herd immunity.
from CNN.com - RSS Channel - HP Hero https://www.cnn.com/2021/05/02/us/covid-vaccine-second-shot-missed/index.html
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