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America needs to test half a million people a day before it can reopen, experts say

The US needs to conduct at least 500,000 tests for Covid-19 a day to safely open the economy and stay open, according to three Harvard researchers.
Currently, about 150,000 tests per day are completed, and about 20% of those have been positive. More testing is necessary to properly understand who is infected and might put others at risk, researchers said.
The current percentage of tests that come back positive in the US is too high, researchers said. The World Health Organization has suggested that the positive test rate should be between 3% and 12%, while the US rate is around 20%.
To achieve a 10% test positivity rate by May 1, about 580,000 people per day would need to be tested, research shows.
The researchers include:
• Dr. Ashish Jha, faculty director of the Harvard Global Health Institute
• Dr. Thomas Tsai, a surgeon at Brigham and Women’s Hospital in Boston and researcher at the Harvard T.H. Chan School of Public Health
• Benjamin Jacobson, research assistant at the Harvard Global Health Institute
Jha wrote in an email to CNN that a formal write-up of their research will be available soon.
“If we can’t be doing at least 500,000 tests a day by May 1, it is hard to see any way we can remain open,” the researchers wrote.
President Donald Trump told reporters the US has conducted more than 3.78 million coronavirus tests to date at a Friday White House briefing.