What exactly is "the desired effect?" If it is to eliminate Covid, the vaccine doesn't seem to help much, considering vaccinated people can still get infected and pass on the infection to others.
As has been mentioned many times on this thread and others, unvaccinated people are at least 5X more likely to contract and transmit COVID-19 to others.
> A reduction was also observed in people vaccinated with the jab made by US company Pfizer and German firm BioNTech. The risk of spreading the Delta infection soon after vaccination with that jab was 42%, but increased to 58% with time.
Nothing is 100% in medicine…