Moderna Says COVID-19 vaccine Remains 90% Effective After Six Months

Beginning two weeks after the second dose, the shot was more than 90% effective overall, and more than 95% effective at preventing severe cases, according to a statement. The company didn’t release further details and said the follow-up results were preliminary as the study is continuing.

The results are similar to those seen after six months with the messenger RNA vaccine from partners Pfizer Inc. and BioNTech SE. In early April, those companies said their vaccine remained 91.3% effective through as long as six months, according to long-term follow-up data from their final-stage trial.

Combined, the companies’ announced findings suggest that protection induced by both messenger RNA vaccines remains strong for at least a number of months. The shots use genetic material to temporarily turn the body’s cells into tiny vaccine-making factories.