Herd immunity ‘likely unachievable’ for emerging coronavirus variants, research suggests

People who are fully vaccinated against COVID-19 can carry the same viral load after contracting the delta variant than those who are unvaccinated, researchers have found, casting doubt over the potential for reaching herd immunity. While two doses of Pfizer/BioNTech’s or Oxford/AstraZeneca’s vaccines still offered good protection against the delta variant, the viral load in ...

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