How much (or how little) protection is offered after just one shot of the pfizer or moderna vaccine? can you engage in any more types of activities after the first shot, like, but not limited to social gatherings, being with friends, travelling?

2 weeks After 1 injection according to a study in Isreal, coverage was 90% but the CDC has determined that 2 shots are required for full protection and about 95% prevention, in the US. Everyone still needs social,distancing and mask, and the vaccines would have a less robust effect preventing covid variants. 2 weeks following your 2nd shot, it is now recommended you can mix with vaccinated others

Moderna vaccine was reported by company to convey about 80.2% efficacy after first dose. However, The World Health Organization stated "efficacy of approximately 92 % in protecting against COVID-19, starting 14 days after the 1st dose." Studies showed that the Pfizer vaccine became 90% effective 21 days after the first shot. Please continue to wear mask & social distance. May do things with others