Prognosis
Variants Spreading in U.S. Fan the Need to ‘Crush’ Covid Quickly
- J&J and Novavax shots less effective versus S. African variant
- Vaccines are working, but resistant forms are gaining ground
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A Covid-19 mutation that likely confers partial resistance to the antibodies produced by vaccines is now in the U.S., spurring scientists to probe new ways to battle a disease that’s constantly changing and could remain active for years.