The emergence of COVID-19 variants such as delta and omicron have sent scientists scrambling to determine whether existing vaccinations and boosters are still effective against new strains of SARS-Cov-2.
In a new study by Yale's Akiko Iwasaki, the Waldemar Von Zedtwitz Professor of Immunobiology, it was found that intranasal vaccination provided broad-based protection against heterologous respiratory viruses in mice.