Vaccines do stop infection & transmission in the vast majority of cases. This tweet is an example of how bad or manipulative descriptions of scientific data can lead to spurious arguments about "infectiousness of the unvaccinated," which I wrote about here alternet.org/2021/09/anti-v…
https://twitter.com/GregBryk/status/1440672455589199877
Conservative media bears a lot of responsibility here, but so does mainstream media. A lot of people walked away from media reports on breakthrough infections & viral loads w/ the impression that ALL vaccinated people were equally likely to spread COVID as unvaccinated people. 
Now, to be clear: the CDC was justified in suggesting extreme caution in response to the viral load & transmissibility research, as well as other factors. However, the science does not suggest that all vaccinated people are equally likely to spread virus.
The viral load research was not just a sample of the vaccinated population where researchers identified possible (unknown) vaccinated carriers of the virus. The research was on people *who had already progressed to infection.* A much smaller subset of the vaccinated population.
Again, caution is warranted, especially if you have kids or are around vulnerable people. That said, we have to fight against the myth that all vaccinated people are just as likely to transmit the virus. That's not what the science says & anti-vaxxers are having a field day w/ it
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