Efficacy of Johnson & Johnson’s single dose COVID vaccine almost 70% against multiple variants

Johnson & Johnson’s single dose vaccine was 66% effective in preventing COVID-19 in a large global trial against multiple variants. In a trial with over 44,000 volunteers, the level of protection against moderate and severe COVID-19 varied from 72% in the United States, to 66% in Latin America and just 57% in South Africa, from […]