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Backlash against Johnson & Johnson's COVID-19 vaccine is real and risky – here's how to make its rollout a success

PROMO Health - Vaccine Words Blocks - iStock - Aksana Kavaleuskaya

More than 50 million Americans have received at least one dose of either the Pfizer or Moderna COVID-19 vaccine. So far, Americans have been largely brand-agnostic, but that's about to change as a new vaccine rolls out.