“Abbott announced that it had received FDA authorization to distribute a new type of test. This test requires only a coated-paper card and a small swab, and the scale of its production is stunning: Abbott says it will begin manufacturing 50 million of these tests a month in October. The tests will cost just $5 apiece. That wasn’t the only news. This morning, the Trump administration announced that it would be purchasing 150 million of these tests from the company. For comparison, states have reported fewer than 75 million tests total over the past six months.” Alexis C. Madrigal in The Atlantic: A New Era of Coronavirus Testing Is About to Begin.

+ Helen Branswell in Stat: Four scenarios on how we might develop immunity to Covid-19.