People who are fully vaccinated can get breakthrough infections and spread the virus to others.
Many unvaccinated patients with COVID-19 wish they had gotten the vaccine UC Davis Health physicians have noted that a number of younger patients, when they come in with critical illness, say that they wish they would have gotten the COVID-19 vaccine.
Vaccine effectiveness in protecting frontline workers decreased nearly 30 percentage points since the delta variant became the dominant strain.
Theoretically, however, there is the possibility that vaccinations exert an immunological pressure on the virus, says Georg Behrens.
That study, also released yesterday, shows that about 25% of COVID-19 infections in Los Angeles country from May through July 25 occurred in fully vaccinated people.
The study has not yet been peer reviewed.