One-dose shot offers good protection; new hope against virus

All Covid-19 vaccines train the body to recognize the new coronavirus, usually by spotting the spiky protein that coats it. But they're made in very different ways.

By

National News

January 29, 2021 - 3:11 PM

Johnson & Johnson’s long-awaited vaccine appears to protect against COVID-19 with just one shot — not as strong as some two-shot rivals but still potentially helpful for a world in dire need of more doses.

J&J said Friday that in the U.S. and seven other countries, the single-shot vaccine was 66% effective overall at preventing moderate to severe illness, and much more protective — 85% — against the most serious symptoms.

There was some geographic variation. The vaccine worked better in the U.S. — 72% effective against moderate to severe COVID-19 – compared to 57% in South Africa, where it was up against an easier-to-spread mutated virus. 

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