Non sterilizing vaccines....
Vaccines Need Not Completely Stop COVID Transmission to Curb the Pandemic - Scientific American Quote "Although many vaccines widely used today (against measles, for example) produce very effective sterilizing immunity, others, such as the hepatitis B vaccine, do not. With these vaccines, an individual’s immune system is trained to prevent illness, yet the pathogen can persist in that person’s body, potentially allowing them to infect others. A lack of sterilizing immunity means that the pathogen can continue to circulate in a population, where it may cause illness in unvaccinated and vulnerable people or evolve to evade our immune responses, Bowdish explains."
Vaccinated will carry the virus and can spread it along with causing variants such as Delta