BOSTON - New research suggests the Moderna vaccine against COVID-19 offers protection for at least six months.Findings published Tuesday in the New England Journal of Medicine echo what Pfizer and its German partner, BioNTech, said last week about their vaccine, which works in a similar way.The study of Moderna’s vaccine followed 33 healthy adult participants and found "antibody activity remained high" across all age groups six months after the second dose, researchers said.