CLOSE At-home testing could transform the fight against the novel coronavirus. USA TODAYTesting for the coronavirus that causes COVID-19 has dropped nationwide the past two weeks even as the evidence builds disease spread is picking up in many states.Nowhere is the danger of the testing slowdown more evident than the South. In Mississippi, more than one in five tested for the virus in the past week were positive, the highest rate in the nation as of Friday. The average number of daily tests in Texas and Florida dropped, but the ratio of positive tests in each state is more than double what the World Health Organization recommends. Official case counts have dropped nationally but reporting problems and generally reduced testing in some states makes it hard to place any confidence that infection rates are improving. And in some states with more reliable data, testing slowdowns coincide with increasing or stable positive rates. “The enhanced positivity rate is the thing that bothers people more than anything else,” said Dr. William Schaffner, a professor of preventive medicine and infectious disease specialist at Vanderbilt University School of Medicine. “Because it suggests this virus is circulating still very briskly, especially in certain parts of the country – in fact, much of the country.”WHO recommends

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