The new coronavirus pneumonia (COVID-19) in the United States has rebounded due to the Delta mutant virus strain.
Of the new daily cases around the world, 1 in 9 is from the United States.
The seven-day average number of new cases in a single day in the United States has soared to 57,126, which is a quarter of the peak period of the epidemic.
The Centers for Disease Control and Prevention (CDC) revised its guidelines on July 27.
The CDC's revised guidelines for wearing masks once again recommend that people who have reached "fully vaccinated" (fully vaccinated) wear masks when entering public indoor places in areas with high transmission rates.
According to the CDC, the infection rate in 63.4% of the United States is high enough to implement measures that require people to wear masks indoors, and that these measures should be resumed immediately.
It said that Manhattan, Los Angeles, San Francisco, and the entire state of Florida have reached the threshold, but Chicago and Detroit have not.
CDC Director Rochelle Walensky told reporters in a conference call that new research shows that if people who have reached "full vaccination" are infected, they carry the same amount of virus as those who have not been vaccinated, but it shows Those who achieve "complete vaccination" may be able to pass the virus to others.
New crown pneumonia in the United States: The US Centers for Disease Control and Prevention urges all students in Class 12 to wear masks when they return to school.
The picture shows a 16-year-old girl vaccinated against new coronary pneumonia in New York on July 27.
(AP)
The CDC issued tightened guidelines earlier in July stating that after classes resumed in the fall, from kindergarten to class 12, all students, teachers and staff, regardless of whether they have been vaccinated, should wear masks.
The CDC previously issued guidelines that only students who have not been vaccinated must wear masks.
US President Joe Biden said he hopes that people in places mentioned in the CDC guidelines will follow the advice.
He said he would visit those places.
He said that increasing vaccinations and wearing masks will help prevent the recurrence of the "closure of the city" in 2020.
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The CDC's recommendations are not legally binding, and many Americans, especially states that support the Republican Party, or choose not to follow.
At least eight states prohibit schools from requiring people to wear masks.
The United States announced two months ago that people who have reached "complete vaccination" do not need to wear a mask, and said that the epidemic has cooled down. Since then, the U.S. vaccination rate has slowed sharply.
Among the eligible persons in the United States, only 58 have reached the status of "complete vaccination".