Happened upon this today...
But the numbers from the CDC suggests otherwise. A new study conducted by 11 medical institutions analyzed a group of people who tested positive for COVID during the month of July.
Among those who were infected, more than 70% reported they had quote, “always worn a mask” for the preceding 14 days. Another 14.4% said they had quote, “often worn a mask.” In other words, 85% who got the coronavirus in July were wearing a mask and they were infected anyway.
You are misrepresenting what the study was about. Read the real data.
The study also found that, of the 154 participants who tested positive, a total of 85% said they had worn a mask either "always" (70.6%) or "often" (14.4%) over the 14 days prior to the onset of their illness. Of the 160 people who had tested negative, conversely, a total of 88.7% said they had worn a mask either "always" (74.2%) or "often" (14.5%).
So reported mask-wearing was not statistically different among people who tested negative than among people who tested positive.
But that's not even the point.
Trump was suggesting that the CDC found that 85% of all people who wear masks get the coronavirus. But the CDC was just looking at the behavior of these 314 symptomatic people who sought out testing at 11 particular sites in July.
Here's how one of the co-authors, Christopher Lindsell, co-director of the Center for Health Data Science at Vanderbilt University Medical Center, described the study's data on masks.
"The data suggest that among a group of patients who are already showing symptoms that prompted them to get testing for the virus, there was no statistical evidence of a difference in mask wearing behavior between those who tested positive and those who tested negative," Lindsell said in an email. "This is very different from the question of whether wearing masks prevents you becoming infected with the virus, and it is also different to the question of how many or what percentage of people who wear masks contract the virus. The study was not designed to answer these questions."
Problem 2: We don't know how frequently the infected people actually wore the mask -- and where they took it off.
The study participants self-reported their behavior. The authors noted in the study that participants' answers might have been affected by the fact that they knew whether they had tested positive or negative before they responded.
And while, again, 70.6% of the infected people said they had "always" worn a mask over the previous 14 days, 40.9% also said they had gone to a restaurant -- where, obviously, people take off their masks.
"Masks cannot be effectively worn while eating and drinking, whereas shopping and numerous other indoor activities do not preclude mask use," the study said.
The CDC would not directly address Trump's claim. But when CNN asked for comment, the CDC emphasized that even people who reported "always" having worn a mask may not have actually done so all of the time. Spokesman Benjamin Haynes noted that "people who attend restaurants cannot wear masks effectively while eating and drinking."
Problem 3: Masks are primarily intended to protect other people, not the person wearing the mask.
There is
scientific evidence that masks provide protection to the people who wear them. But even if mask-wearers do end up getting infected, that does not mean masks aren't working at all -- because masks can still help others from getting infected. Haynes said, "CDC guidance on masks has clearly stated that wearing a mask is intended to protect other people in case the mask wearer is infected."
The CDC continues to be a vocal advocate of mask use. In September, after this study was published, CDC director Dr. Robert Redfield pleaded in congressional testimony for "all Americans" to wear a mask, saying: "We have clear scientific evidence they work, and they are our best defense."