@dianaberrent @MrYuksSeaShanty @DrEricDing @CDCgov @CDCDirector 3% positivity if testing is uniform or random = 1 kid in each class positive on average, and was probably positive the day before testing too.
@dianaberrent@MrYuksSeaShanty@drericing@CDCgov@cdcedirector如果测试是均匀或随机的，则阳性率为3%=平均每班1个孩子呈阳性，并且可能在测试前一天也呈阳性。