WASHINGTON—U.S. health officials have authorized two more over-the-counter COVID-19 tests that can be used at home to get rapid results. The move by the Food and Drug Administration is expected to vastly expand the availability of cheap home tests that many experts have advocated since the early days of the outbreak. The announcement late Wednesday comes as U.S. testing numbers continue to slide, even as the number of new coronavirus infections is rising again. The FDA said Abbott’s BinaxNow and Quidel’s QuickVue tests can now be sold without a prescription. Both tests were first OK’d last year but came with conditions that limited their use, including prescription requirements and instructions that they only are used in people with symptoms. The home tests allow users to collect a sample themselves with a nasal swab that is then inserted into a test strip. Results are usually available in 10 to 20 minutes. …