The study makes the US change the rules to wear a mask
CDC's research shows that 70% of NCOV cases in the new outbreak in Massachusetts have adequate vaccines, making the officials tighten the mask.
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America warning Delta transformations are contagious like chickenpox
The Center for Control and Prevention of American Disease Warning Delta is causing more seriously and spreads easily as chickenpox.
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America can be changed to change masks
The US health authorities are expected to change the recommendation, suggesting that the person who has full vaccine is wearing a mask when in a closed room environment.
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