more than half of all transmission cases of SARS-CoV-2 are from people who are not showing any symptoms. Stay informed with live updates on the current COVID-19 outbreak and visit our coronavirus hub for more advice on prevention and treatment.Therefore, governments and officials who are planning the safest way to ease restrictions need to know whether or not people who have been vaccinated can still experience asymptomatic infections.A new study by researchers at the Mayo Clinic in Rochester, MN, now offers reassurance that the Pfizer-BioNTech and Moderna mRNA vaccines provide a high degree of protection against asymptomatic infection.Their analysis suggests that the risk of such an infection is 79% lower among those who received a first.