The study makes the US change the rules to wear a mask
The study makes the US change the rules to wear a mask news Bronson Kittler 31 Jul 2021 (96) CDC's research shows that 70% of NCOV cases in the new outbreak in Massachusetts have adequate vaccines, making the officials tighten the mask. This finding is very worrying and is an important discovery that leads to the recommendations to wear a mask of the Centers for Disease Control and Prevention (CDC). Photo: CNBC. According to the data publishe...