- Two doses of an mRNA (Pfizer-BioNTech or Moderna) vaccine or one dose of viral vector (Johnson & Johnson) COVID-19 vaccine was insufficient to produce adequate immunity to a lab-created Omicron variant, but a booster dose of an mRNA COVID-19 vaccine provided the best immune protection. https://www.medicalnewstoday.com/articles/covid-19-mrna-booster-vaccine-offers-best-protection-against-omicron 3613 comments science
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