Even fully vaccinated people can get the Delta variant, but they may be asymptomatic or mildly ill, and can still transmit it to unvaccinated people. This Delta Variant is twice as transmissible as the original CoVID19.
https://www.politifact.com/article/2021/jul/07/coronavirus-variants-what-you-need-know/
So get vaccinated. You may be saving other lives.