The way I read it is that.

you get vaccinated

- they are only guaranteeing protection for 3 month

Currently guidelines of CDC

- you can still be a spreader

Quote:

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“You’re self-protected, but you still could be a danger to other people, especially if you start using behavioral disinhibition, saying, ‘I'm vaccinated, I'm invulnerable’,” Corey says. “You could acquire Covid and it will be silent, and then you can infect a bunch of people who are not as lucky as you to be vaccinated at this point in time.”

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Quote:

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To test whether this population is spreading live virus, Corey says researchers need to collect samples from a large group of vaccinated people multiple times per week for evidence of viral shedding.

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- no mutation needed