COVID-19 vaccines, at least one country is considering mixing and matching different doses.A trial, led by Oxford University is now underway in the United Kingdom to test the safety and efficacy of mixing different shots to protect against the novel coronavirus.If the results are positive, experts say the practice could help ease supply chain issues and help boost a more robust immune response in recipents.
Feds ‘in discussions’ to secure COVID-19 booster, variant shots: Health Canada So far, Health Canada has approved four vaccines to protect against COVID-19.Two are mRNA vaccines — one from Pfizer-BioNTech and the other from Moderna.Vaccines from Johnson & Johnson and AstraZeneca-Oxford have also been approved for use in the country.All.