I wrote out a long post that I am concerned would derail the thread on another topic I am more familiar with and consider myself to have some expertise in that relates to the CDC.
So I'll instead just raise the question: Does the CDC have epistemic validity?
(My answer based on the subject matter I am more familiar with is that on any particular subject, unless their claims are investigated, they don't have epistemic validity. For me to say they do would be to suffer Gell-Mann amnesia.)
It might also be of interest for people to know the CDC receives very substantial non-governmental funding from Bloomberg, the Bill and Melinda Gates Foundation, and the CDC Foundation which is an umbrella fundraising organization. One of those organizations in particular has had a large, undue influence on the CDC.
It is not strictly a governmental organization, which is unfortunate. Many other countries, like the UK, can point to an organization like NHS as both a purely public good.
I am less academically knowledgable about COVID than this other subject, but just based on reading the news:
With COVID, they discouraged masking later claiming it was better to lie to the public than use complicated messaging regarding the scarcity of resources. But they also failed to acknowledge the airborne nature of COVID when that was much better understood in Asian countries early on.
Then they told Americans not to mask if they were vaccinated.
Then they came out with some convoluted plan about which counties needed to mask based on infectivity rates that basically meant virtually all of the country *should* be using masks, but which left wiggle room for people to give up on it. To this day, they only advise masking if you are in an area of "high or substantial risk." Are people supposed to check a map each day to know? Does the CDC even know which areas of the country are at high or substantial risk? Their main efforts to far have been retrospective, not at assessing future risk, which is important because right now you really don't know wha the local risk is until the numbers go upward. So their advice is to look at a map of what has happened rather than what is happening because they just don't know. All the data by definition is old. I'm not expecting them to have an oracle, but they could have just scrapped the advice and told everyone to wear a mask because their advice applied to practically everyone anyway.
I do think people should continue to wear masks indoors, but I don't think appealing to the CDC is the best, especially when it comes to masks, where their advice has been terrible.
Edit: Not sure if anyone remembers, but there was a graph from their forecasts web-page going around when Delta was first ramping up where they took every forecast available and they combined all the forecasts and it was just all over the place, and it was sort of being lambasted and looked at quizzically by a lot of epidemiologists—mainly because the CDC wasn't even attempting to do any forecasting of their own. From cases going lower to apocalyptic levels. I just checked their site and their forecasts are still based on other sources (they don't do their own estimates) and are still basically useless with a variation of 500k cases, and they concede:
"Ensemble forecasts combine diverse independent team forecasts into one forecast. They have been among the most reliable forecasts in performance over time, but even the ensemble forecasts do not reliably predict rapid changes in the trends of reported cases, hospitalizations, and deaths. They should not be relied upon for making decisions about the possibility or timing of rapid changes in trends.
More reported cases than expected have fallen outside the forecast prediction intervals for 3- and 4-week ahead case forecasts. Case forecasts at those horizons and assessments of likely increases or decreases will not be shown until sustained improvements in performance are observed.
This week’s national ensemble predicts 540,000 to 1,070,000 new cases are likely to be reported in the week ending December 18, 2021."
And remember their mask guidance is contingent on infectivity rates by county—yet their own estimates vary by 500k cases.
CDC provides credible COVID-19 health information to the U.S.
www.cdc.gov
How can they tell people to wear masks based on the risk in their area when they can't predict the risk?
It's such a stupid position, especially given that their advice (at least at the time they first gave it) applied to virtually every county in the US. They should have just made a blanket policy.