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CDC endorses booster doses of Moderna and Johnson & Johnson vaccines, says mix and match is fine
FDA authorizes booster doses of Moderna and Johnson & Johnson vaccines, says mix and match OK
Instead of quarantine for Covid-exposed students, some schools are trying test-to-stay
Why vaccinated people dying from Covid-19 doesn't mean the vaccines are ineffective
Vaccine mix-ups are rare and there are systems in place to keep it that way
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