WHAT THE SCIENTISTS KNOW, AND DON’T KNOW TODAY
Vaccinated people could potentially still get Covid-19 and spread it to others. However, the benefits of relaxing some measures such as testing and self-quarantine requirements for travelers, post-exposure quarantine requirements and reducing social isolation may outweigh the residual risk of fully vaccinated people becoming ill with the virus or transmitting the virus to others. This is presumably what the Thai government is considering when drafting its plan to reopen Phuket.
As far as people who are vaccinated still being able to spread the virus: It’s possible that some people who are fully vaccinated could get Covid-19. The evidence isn’t clear whether they can spread the virus to others. Scientists have made it clear that current research is far from sufficient to claim that vaccinated people cannot spread the virus.
https://www.nytimes.com/2021/04/01/h...-walensky.html