Following up first doses of the AstraZeneca or Pfizer vaccines with second doses of the Moderna or Novavax jabs generates robust immune response against COVID-19, according to a study published in The Lancet journal.
According to the study, 'mixed' schedules of these vaccines induced high concentrations of antibodies against the SARS-CoV2 spike IgG protein when doses were administered four weeks apart.
Two doses of Pfizer and AstraZeneca COVID-19 vaccines generate lower levels of antibodies against the Omicron variant of coronavirus, according to a study which suggests that those previously infected or vaccinated may be at an increased risk of infection.
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