I read an article today discussing this. They say that asymptomatic and mandatory tested without symptom vaccinated people shouldn't even be counted as breakthrough because the vaccine did it's job. The test is picking up dead virus residue which tried to infect them but didn't make it.The mRNA vaccines are supposed to help protect from asymptomatic infection and transmission. It does not eliminate all infections however, and does not prevent all transmission.
What The Latest Science Shows About Breakthrough Cases
With news about vaccinated people getting coronavirus infections, should you be worried? How common are breakthrough infections? Here's what scientists know and what they're trying to learn.
www.npr.org
In fact, the CDC doesn't even recommend routine testing of asymptomatic vaccinated people for the coronavirus. As Gandhi of UC San Francisco explains, positive tests might just be picking up "dead viral particles in your nose," she said. "Vaccinated people may get it in their nose, but they're going to kill it — that's actually what the immune system does.""I think we are misusing the term breakthrough," said Dr. Paul Offit, director of the Vaccine Education Center at Children's Hospital of Philadelphia. "If someone who is fully vaccinated is subsequently hospitalized or killed by the virus, that's a breakthrough case." He said he wouldn't call an "asymptomatic or relatively mild case" a "breakthrough case."
What matters, he said, is "the vaccine is still doing what it is designed to do — keep people out of the hospital and out of the morgue."