This article from 4 days ago says 80:
One dose of Pfizer or Moderna vaccines was 80% effective in preventing Covid in CDC study of health workers
Like just about all CDC covid studies, this study has a headline saying one thing but the guts of the study saying another.
The majority of the participants were younger healthy white people. None of those demographics are ones that covid most negatively affect. They also did not test for covid or antibodies prior to the study.
Then there's this from the study:
The findings in this report are subject to at least three limitations. First, vaccine effectiveness point estimates should be interpreted with caution given the moderately wide CIs attributable in part to the limited number of postimmunization PCR-confirmed infections observed. Second, this also precluded making product-specific vaccine effectiveness estimates and limited the ability to adjust for potential confounders; however, effects were largely unchanged when study site was included in an adjusted vaccine effectiveness model and when adjusted for sex, age, ethnicity, and occupation separately in sensitivity analyses. Finally, self-collection of specimens and delays in shipments could reduce sensitivity of virus detection by PCR (10); if this disproportionately affected those who received the vaccine (e.g., because of possible vaccine attenuation of virus shedding), vaccine effectiveness would be overestimated.
This study seems nothing more like a PR stunt to encourage more front line workers to get vaccinated.