Doctors are trialling the world's first mRNA vaccine against norovirus, aiming to reduce health and economic burdens. The phase 3 trial, called Nova 301, will enroll 25,000 adults, focusing on those over 60, across several countries. The vaccine, based on mRNA technology, is expected to generate a strong immune response. If successful, a marketing application could be submitted in 2026, with further trials planned for teenagers and younger children.