Below is something I came across tried linking but didn't work.
It would appear that there are some initial studies going on in Israel as it has the largest amount of vaccines rolled out.
"Does the Vaccine Protect Against Infection?
In an
ongoing study, “Maccabi health services” and KSM research center, studied the first 430,000 people who were vaccinated at their nation-wide vaccination centers.
They checked the group’s infection rates in the first few days since receiving the first dose, and then checked infection rates within the group 13 days after the first dose was given. The researchers found that on the 13th day, infection rates drop by 60% compared to those in the early days after the vaccine was given.
A second ongoing study is being conducted by “Klalit health services” and its research center. In this study, 400,000 participants were tested — half of which received the first dose of the Pfizer vaccine, while the other half didn’t get a vaccine at all.
The first 5–12 days had no effect in terms of protection. The researchers saw a similar rate of infection between the two groups. However, in this study, day 13 saw a slight change while day 14 brought a drop of 33% in infections for the vaccinated group compared to their unvaccinated counterparts.
What Does That Mean?
Most importantly, this is the first indication that the vaccine prevents infection and not only symptoms, even if only to a certain extent.
While the first few days after receiving the first dose seem to have no effect at all; The studies mark the 13–14 days as the tipping point in which the body creates a certain level of protection against the virus.
A 60% drop in infections compared to the early days after the first dose, and a 33% drop in infections compared to a group that wasn’t vaccinated at all is an optimistic prospect. And yet, it is important to note that some of the participants were infected even after the 13-day mark.
“These are initial indicators but they are certainly uplifting,”
says Prof. Ran Balicer head of Klalit research.
“and yet, the first dose doesn't give full protection in any case. People who received the first dose would still need to wear a mask and maintain social distancing.”