A study published in JAMA involving healthcare workers found that the first dose of Moderna’s (NSDQ:MRNA) COVID-19 vaccine was highly effective at reducing the risk of COVID-19 infections.
In the study, participants received two doses of the vaccine at the recommended 28-day interval. Clinical effectiveness reached 95% for days 15 through 42 of the study. But constraining the window to days 15 to 28 resulted in similar results.
The findings suggest that the vaccine can rapidly reduce the incidence of vaccine-sensitive SARS-CoV-2 infection in healthcare workers.
Even eight days after administration of the first dose, the vaccine yielded greater than 70% efficacy.
The study authors concluded that their findings were in line with aggregated data for the Pfizer-BioNTech BNT162b2 and Moderna’s mRNA-1273 vaccines.
The 42-day study began on Dec. 22, 2020. It involved 4,028 participants.
A number of healthcare workers have made headlines recently weeks for resisting vaccination requirements. A U.S. federal judge recently through out a suit from 117 workers at Houston Methodist hospital. Workers at the Indiana University Health have also resisted a vaccine mandate.