mRNA-encoded self-assembling enveloped virus-like particles presenting SARS-CoV-2 spike protein enhance immunity and may provide better protection against viral variants.
The immunizations are designed to target the latest Omicron subvariants, and are only authorized for people who have already received their primary vaccinations.
Researchers continue to debate whether US President Abraham Lincoln was coming down with smallpox as he delivered his famous Gettysburg Address, and if he had been immunized.