Johnson & Johnson says Covid-19 booster shot is 94% effective

J&J said a booster given two months after the first dose increased antibody levels four to six-fold

Johnson & Johnson said on Tuesday a second shot of its Covid-19 vaccine given about two months after the first increased its effectiveness to 94 per cent in the United States against moderate to severe forms of the disease. That compares to 70 per cent protection with a single dose.

The data will help J&J make its case to US regulators for a booster shot even as the company stresses the durability of its single-shot vaccine as a tool to ease the global pandemic.

US President Joe Biden is pushing for booster shots in the face of surging hospitalisations caused by the