All severe cases are from unvaccinated people.
Risks of myocarditis, pericarditis, and cardiac arrythmias associated with COVID-19 vaccination or SARS-CoV-2 infection.
If infection-based immunity lasts only for something like months, that provides a tight deadline for delivering vaccines.
Variants of the novel coronavirus have emerged, such as the highly infectious.
Preprint at medRxiv 2021.
Some states, such as Georgia and Utah, have fully vaccinated less than 10% of their populations, whereas Alaska and New Mexico have fully vaccinated more than 16%.