The CDC’s claim that vaccinated people have similar viral loads from Delta as unvaccinated people is now spreading far and wide on social media. The Washington Post obtained their internal slide deck here, with the unpublished data supporting this claim on slide 17.
Does anyone understand how to square this with various other studies from the past few months with more positive results for vaccine efficacy, serum neutralization, etc.? Or even better, does anyone have the actual source for this data? To me, this claim seems too extreme to be likely, but even my many PhD scientist friends mostly seem to be accepting this completely uncritically.
The Hill has published some more information:
I still have the impression that this data could be systematically biased: it makes sense that the viral load would be high among identified cases, but randomized testing of the broader population is needed to understand the base rates.