As new strains complicate vaccine picture, Moderna plans studies of a COVID-19 booster shot - The Boston Globe

As new strains complicate vaccine picture, Moderna plans studies of a COVID-19 booster shot - The Boston Globe: The Cambridge biotech said its two-dose COVID-19 vaccine generates a weaker immune response against a worrisome strain of the disease that first emerged in South Africa, prompting the firm to plan a clinical study of a “booster” shot. The company said those antibody levels are still enough to protect people against the South African variant.