Covid-19 vaccines made by Moderna and Pfizer-BioNTech are proving highly effective at preventing symptomatic and asymptomatic infections under real-world conditions, federal health researchers have reported. There has been debate over whether vaccinated people can still get asymptomatic infections and transmit the virus to others. The weekly swabs allowed the researchers to detect asymptomatic infections as well as symptomatic ones. Among those who were fully vaccinated, there were .04 infections per 1,000 person-days, meaning that among 1,000 persons there would be .04 infections in a day. There were 0.19 infections per 1,000 person-days among those who had had one dose of the vaccine.

Source: The Irish Times March 29, 2021 17:04 UTC