Some doctors, burned by low reimbursements, have stopped testing for the virus. Patient samples to be tested for Covid-19 in Houston last year.Credit...Erin Schaff/The New York Times Feb. 3, 2021 Across the United States, some doctors are seeing reimbursement rates so low that they do not cover the cost of the test supplies, jeopardizing access to a tool experts see as crucial to stopping the virus’s spread. With new variants of the coronavirus emerging, experts say testing will be crucial to containing the pandemic’s spread. But the low fees have led some doctors to stop testing certain ...