They realized it from the beginning. The vaccine does nothing for surfaces of the mouth and throat, which are constantly collecting new airborne particles.We have known this for a long time. With time the scientists and Doctors realized that the virus was transmissible even if vaccinated.
The HUGE difference continues to be that people will get the virus but they will not end up in the hospitals, which are full, in ventilators, or dead.
In Ventilators or dead, are the main things the vaccine avoids for people.
Applaud it.