The US population numbers 330 million. 22.3% are too young to receive a Covid-19 shot. Assuming 25% of the adult population are unwilling to be vaccinated, that leaves 192 million to be vaccinated, or 58.8%, well below the most optimistic percentage needed to achieve herd immunity. We must vaccinate children/adolescents as soon as the FDA approves it, and Sars-Cov-2 is not going to go away very quickly.