Thinking About Health: What you need to know about coronavirus testing

Testing! Testing! Testing! That’s what the experts said is necessary to move the country back to normalcy. Almost daily, local TV stations in New York City where I live run public service announcements urging viewers to get a test for COVID-19. Those announcements tell how to find a testing site, and most point out that the tests are free.

Many New Yorkers, as well as people in other states, are undoubtedly confused about the kinds of tests available, wonder about the delays in getting results and worry about the tests’ reliability. The recent experience of Gov. Mike DeWine of Ohio, who first...