The recently released CDC study shows that the Moderna and Pfizer vaccines are 90% effective at stopping both symptomatic
and asymptomatic infection:
"Last week, the Centers for Disease Control and Prevention (CDC) released initial results from a
studyTrusted Source on the real-world effectiveness of the two mRNA vaccines approved in the United States, those developed by Pfizer-BioNTech and Moderna-NIAID.
Researchers collected weekly nasal swabs from all participants to see if they had any viral genetic material, regardless of whether they had COVID-19 symptoms.
They also collected an additional nasal swab and saliva sample if people developed symptoms.
The vaccines were 90 percent effective at blocking infections — symptomatic and asymptomatic — in people who had two doses of the vaccine, and 80 percent effective in people who had one dose.
That means there was a 90 percent decrease in infections in people who were fully vaccinated compared with a similar unvaccinated group of people."
The concern previous to this study was that the vaccine might simply be reducing the amount of viral load so that people were asymptomatic, but still capable of spreading the virus. This study shows that's not the case. You can't spread an illness that you don't have and that's the basis of herd immunity.
https://www.healthline.com/health-n...t-we-know#Some-vaccines-block-most-infections