By LAURAN NEERGAARD and LINDA A. JOHNSON Associated Press 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 […]

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