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Mixing Pfizer, AstraZeneca COVID-19 shots with Moderna gives better immune response – UK study

A major British study into mixing Covid-19 vaccines found that people had a better immune response when they received a first dose of AstraZeneca or Pfizer-BioNTech shots followed by Moderna nine weeks later, according to the results on December 6.


Omicron may raise re-infection risk; booster protection documented

Survivors of previous infection with the virus that causes SARS-CoV-2 may be at higher risk for re-infection with the Omicron variant than with earlier versions of the virus, preliminary findings show. Additionally, a booster shot of the Pfizer/BioNTech Covid-19 vaccine appears to provide strong protection – at least in the short term – according to data from Israel.