News Johnson & Johnson says its booster vaccine offers a ninefold increase in antibodies: Latest COVID-19 updates August 25, 2021August 25, 2021 Christal Hayes, Jeanine Santucci and Ryan W. Miller, USA TODAY Comments Off on Johnson & Johnson says its booster vaccine offers a ninefold increase in antibodies: Latest COVID-19 updates Johnson & Johnson said studies show a booster dose of its vaccine offered a ninefold increase in antibodies. The latest COVID-19 updates.