Since the outbreak of the epidemic, the United States has been criticized for its insufficient detection capacity and long detection cycle. Public health experts in the United States pointed out that only within two to three days of new coronavirus detection results can play a role in controlling the spread of the epidemic. However, according to a new survey by the US media, 40% of Americans have to wait more than three days for their new coronavirus test results to be received. From July 30 to August 10, 9444 respondents from the United States were surveyed with online questionnaires by consumer news and business channel, a data company, from July 30 to August 10. The results showed that 40% of people took more than three days to receive new coronavirus test results. In fact, the feedback time of virus detection results more than 48 hours “has missed the best time to track close contacts”, while more than 72 hours of testing results can be said to be “meaningless”. < p > < p > Bill Gates, co-founder of Microsoft in the United States, has also repeatedly criticized that “those tests that can only get results after three days are completely wasted.” < p > < p > Microsoft co-founder Bill Gates: so far, the testing problems in the United States are shocking, because the federal government has not improved the new coronavirus detection problems, they just want to say how good they have done. I want to say, stop paying for tests that don’t get results in three days. You spend billions of dollars getting the least valuable results compared to the rest of the world. < / P > < p > the survey shows that in some of the 50 states in the United States, such as Massachusetts and South Dakota, the average time for detection of new coronavirus is about two days; in Arizona and West Virginia, the average time is nearly four and a half days; in Indiana, the average time for detection of new coronavirus is even more than five days. Ashesh JHA pointed out that this is the result of the lack of unified control at the national level in the United States in the fight against the epidemic, and the various states are scattered. < / P > < p > in addition, experts also pointed out the problem of the recent decline in the detection volume in the United States. Since the middle of July, the number of new cases per day in Florida, Arizona and Texas has decreased significantly, but at the same time, the daily detection volume in these States has also decreased by nearly half. Ashesh JHA said that made it difficult for experts to determine whether the slowdown in the growth of cases was caused by a drop in the number of tests, and thus to determine the true severity of the epidemic.