Pretending that Good News is Bad News

The headline of a news story today:

CDC study shows COVID-19 cases may be 10 times higher than reported

The story warns that this shows that states that are opening up are making a mistake, that the problem is worse than we thought. It does not seem to have occurred to the author that if there are ten times as many cases as we thought and the same number of deaths, that means that the disease is only a tenth as lethal as we thought it was, which is an argument in favor of opening up, not against. Nobody has been arguing that we should respond to each year's flu season with a lockdown.The article also does not mention that this is the same result, in a somewhat stronger form, that was reported by people at Stanford quite a while back, on a similar basis, and for which they were severely criticized.The explanation may be political bias. Trump has tended to downplay the seriousness of Covid, his opponents to do the opposite, and most reporters, probably including the author of this article, are opposed to Trump. But it may also be the bias that leads many people to believe that everyone else should be taking more precautions — against Covid, overweight, or anything else — than they are, hence to regard it as socially responsible to exaggerate any news that makes a threat look bigger, downplay or ignore news that makes it look smaller. It is an issue I have discussed before, in other contexts, several times.P.S. Looking at another source, it looks as though the claim is between two and thirteen times the number of known cases (for the U.S.). But I think previous mortality estimates already took account of some asymptomatic cases, so were using something larger than the known cases figure.That said, the commentary continues to get precisely the wrong conclusion:

Jennifer Nuzzo, an epidemiologist at the John Hopkins Center for Health Security who was uninvolved in the study, told The Washington Post. “This study should put to bed any further argument that we should allow this virus to rip through our communities in order to achieve herd immunity.”

If the number of people who have had the virus is (say) twice the number we thought it was, then the deaths we have suffered so far have brought us twice as far towards herd immunity as we thought. Aiming at herd immunity may or may not make sense, but the new evidence makes the strategy look better than before, not worse, which is the opposite of Ms Nuzzo's claim.