It is not zero case. But to reduce the speed of infection so that hospital have resources to cope with people sick with Covid19.
The reason is there's no herd immunity and vaccine.
But we have a chance that 60% people in the world are immune and thus the other 40% will have less chance to get covid19. Unfortunately that would mean 60% will need to be infected and hopefully this 60% is healthy and have mild symptom only and then straight recover.
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