FILE - In this Saturday, March 28, 2020 file photo, medical and physician assistant students wear personal protective equipment as they prepare to screen for possible coronavirus cases at a makeshift camp for the homeless in Las Vegas. Between 10% and 20% of U.S. coronavirus cases are health care workers, though they tended to be hospitalized at lower rates than other patients, health officials reported Tuesday, April 14, 2020. (AP Photo/John Locher)
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