CLOSE COVID-19 widespread testing is crucial to fighting the pandemic, but is there enough testing? The answer is in the positivity rates. USA TODAYPresident Donald Trump urged the nation “to be careful” over Labor Day weekend as health experts worry holiday gatherings — including a state fair in the virus hotspot of South Dakota — will fuel the spread of the virus.In the weeks following the previous two summer holiday weekends — Memorial Day and the Fourth of July — positive tests climbed in the nation, according to Johns Hopkins University data. After peaking in mid-July, positive tests have been on a slow downward trend in the nation. Deaths peaked in the spring and have been slightly falling from a smaller second spike over the summer.Hours after mocking Democratic opponent Joe Biden for wearing a mask, Trump asked Americans to keep their distance from each other as they celebrated the holiday, “wearing a mask whenever the distancing is not possible.”The pivotal weekend comes amid more grim projections for the death toll of the virus. The Institute for Health Metrics and Evaluation at the University of Washington’s School of Medicine says more than 410,000 deaths are predicted by January if mask usage stays at current rates. If governments continue relaxing social

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