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A seat belt, distributes the kinetic force from 2 cm, to about 3 dm. (metric). That softens the damage down to at least 0,6%.
A vaccine in the best case gives you an advantage of 4 hours. That means it soften the damage to around 98%. In the best case+ a chance of nasty side effects.
Belt 150 times saver as no belt.
Vaccine best case 1,02 times saver.