This study can hardly be more official. The researchers were not critics of vaccination either.

They studied a Corona outbreak in a prison in Texas in July 2021. In the following weeks, regular smears and tests were taken from a selected group of inmates. The result: There is no difference whatsoever between the vaccinated and non-vaccinated inmates.

No statistically significant difference was detected in the duration of viral culture positivity between participants who were fully vaccinated (median: 5 days) compared with those who were not fully vaccinated.