Share the QR code < / P > < p > with friends and circles of friends < / P > < p > [text / observer network Liu Chenghui] according to the latest research released by the CDC on the 30th, a county in Massachusetts had a number of cluster infections in July, of which nearly three-quarters (74%) had completed vaccination. The U.S. Centers for Disease Control and prevention pointed out that the discovery may further strengthen local epidemic prevention measures, such as requiring that masks be worn in indoor public environments < p > according to the statistics of Bloomberg, by the end of July, more than 110000 breakthrough infection cases had been found in 35 states in the United States, which is more than 10 times the data of the CDC at the end of April < p > the latest research data of the CDC < / P > < p > in the two weeks from July 3 to 17, barnsbury County, Massachusetts, held many public gatherings, attracting thousands of people from all over the United States. From July 6 to 25, the researchers collected 469 newly confirmed cases in the local area, all related to the rally. The study showed that the vast majority of these cases were men (87%), and 346 patients (74%) had completed the vaccination of two doses of mRNA vaccine or single dose of Johnson & Johnson vaccine; Of the vaccinated patients, 274 (79%) developed common symptoms, such as cough, headache, fever or muscle pain; Of the five hospitalized patients, four had finished the vaccine. As of the 27th, there had been no deaths < p > the study also pointed out that these infections were mainly caused by delta virus strain. Delta virus was detected in 90% of 133 patients who completed gene sequencing. In 211 confirmed cases, the viral load of the samples of vaccinated confirmed patients was similar to that of the samples not vaccinated and not fully vaccinated, which means that their viral infectivity is equivalent < p > affected by the highly infectious delta strain, the recent epidemic data in the United States are not optimistic. In the past week, the average number of new cases in a single day in the United States has exceeded 61300, which has been on the rise since it fell to a low of 11299 this year on June 22. According to Bloomberg, the US CDC completely stopped tracking breakthrough infection cases in May this year, and now this consequence has emerged < p > at that time, the CDC only found 10262 breakthrough infection cases in the United States, but in the following months, the number of confirmed cases after vaccination increased sharply, and the risk increased greatly. Bloomberg collected data from 35 states and found that by the end of July, there had been more than 110000 breakthrough infection cases, which was more than 10 times the data of the CDC at the end of April. This figure will continue to rise in the future < p > trend chart of new cases in a single day in the United States (figure from our world in data) < / P > < p > in the face of this situation, the CDC moves frequently. On the 27th, they revised the epidemic prevention guidelines and recommended that Americans who have been vaccinated but in areas with serious or high-risk epidemic situations wear masks indoors. Two months ago, the CDC also said that people who have been fully vaccinated can not wear masks in most indoor and outdoor environments. On the 29th, the Washington Post disclosed an internal document of the U.S. Centers for Disease Control and prevention, which reported that the transmission power of delta mutant virus is comparable to chickenpox, and officials must "admit that the war has changed" < p > "this situation is worrying, which is the key factor that prompted us to update the recommendations for wearing masks." "We have updated our epidemic prevention recommendations to ensure that vaccinated people will not inadvertently spread the virus to others," Rochelle walensky, director of the CDC, said in a statement < p > people in New York travel with masks (pictured from visual China) < / P > < p > at present, the vaccination rate in the United States is 57.4%, and 49.5% of the total population has completed all vaccination. The Biden administration is vigorously promoting the U.S. vaccination program and trying to introduce mandatory vaccination. The US consumer news and business channel (CNBC) pointed out that the latest research of the CDC and the measures to change the mask recommendations clearly had an adverse impact on the Biden government's promotion of vaccines

Ben Vakana, a member of the White House COVID-19 response team (Ben Wakana), has been sending a 30 day press release to the United States, expressing its dissatisfaction with the US media's rendering of the data. "The speed of spreading the virus is different between those vaccinated and not vaccinated, and if we do not take this factor into consideration, it is wrong," said Ben Vakana. In another tweet, WAKANA went on to argue that "this is completely irresponsible... There are very few cases of virus transmission among vaccinated people in the United States, and almost all hospitalizations and deaths are unvaccinated people." < p > according to the statistics of Johns Hopkins University, as of 11:21 a.m. Beijing time on the 31st, the cumulative number of newly diagnosed cases in the United States exceeded 34.94 million, and the cumulative number of deaths exceeded 613000