The Food and Drug Administration on Wednesday authorized the first rapid coronavirus test that doesn’t need any special computer equipment to get results. The 15-minute test from Abbott Laboratories will sell for $5, giving it a competitive edge over similar tests that need to be popped into a small machine. The portable test is based on the same technology used to test for the flu, strep throat and other infections. It’s the latest cheaper, simpler test to hit the U.S. market, providing new options to expand testing as schools and businesses struggle to reopen and flu season approaches.