Influenza viruses constantly shapeshift to evade recognition by the immune system. This shapeshifting occurs in critical proteins like hemagglutinin (HA), which controls how the virus attaches to human cells before entering them. Influenza viruses can evade immunity in two major ways: through t...
Source: [Phys.org](https://phys.org/news/2026-09-amino-acid-swap-nanoparticle-vaccine.html)