I haven't seen this mentioned but very promising initial results of study in Israel that pfizer vaccine prevents transmission.
It's from the Daily Telegraph
"Pfizer vaccine recipients are unlikely to transmit the virus to others, according to the author of an Israeli study.
Participants in the survey developed up to 20 times more antibodies within a week of receiving the second dose of the Pfizer/BioNTech vaccine.
The survey, which reviewed data from 102 of about 1,000 of the Sheba Medical Centre’s medical staff who have received both shots, showed that only two subjects have developed low amounts of antibodies - one of the subjects suffered from a compromised immune system.
There was no explanation for why the second person did not develop antibodies, and the hospital said it was investigating the matter.
The rest - 98 per cent - have developed levels of antibodies that were even higher than patients who have recovered from a serious coronavirus-induced condition, the hospital said in a statement released on Monday.
How does the Pfizer BioNTech vaccine work Professor Gili Regev-Yohai, director of Sheba’s Infectious Disease Epidemiology Unit, said that people who received both doses of the vaccine will most likely not become carriers of the virus and will not spread it further due to the high level of antibodies they have obtained.
It is the first indication that a Covid-19 vaccine may stop transmission."