Johnson & Johnson says additional dose boosts Covid vaccine efficacy
Johnson & Johnson said Tuesday that a large, global study showed its Covid-19 vaccine is more effective when given as a two-dose regimen, and that other data indicate the efficacy of the vaccine does not wane.
The two-dose regimen prevented 75% of moderate to severe Covid cases in all countries where it was tested — and 94% of such cases in the United States, where the vaccine probably had to grapple with fewer variants of the SARS-CoV-2 virus. Importantly, the two-dose regimen was 100% effective against severe disease.
Read Original Article: Johnson & Johnson says additional dose boosts Covid vaccine efficacy »
