Not semantics at all, long term, it's an unknown, you say significant....measured over months!!! it would be foolish to think otherwise to think vaccinated people are virus free...common sense prevails yet again!!
A quote from medical news site in the states
"As good as they are, these shots aren't perfect. Their protection differs from person to person depending on age and underlying health. People with immune function that's weakened because of age or a health condition can still become seriously ill, and, in very rare cases, die after vaccination.
When people are infected with Delta, they carry approximately 1000 times more virus compared with previous versions of the virus, according to a
recent study. All that virus can overwhelm even the strong protection from the vaccines."
"One of the biggest questions about breakthrough cases is how often people who have it may pass the virus to others.
"We know the vaccine reduces the likelihood of carrying the virus and the amount of virus you would carry," Wen told CNN.
But we don't yet know whether a vaccinated person with a breakthrough infection may still be contagious to others.
For that reason,
the CDC says that fully vaccinated people still need to be tested if they have symptoms and shouldn't be out in public for at least 10 days after a positive test.
How should fully vaccinated people behave? That depends a lot on their underlying health and whether or not they have vulnerable people around them.
If you're older or immunocompromised, Schaffner recommends what he calls the "belt-and-suspenders approach," in other words, do everything you can to stay safe.