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Should we mix and match doses from different COVID 19 vaccines? Experts say maybe National Post Pfizer says 3 COVID vaccine doses are safe, effective for kids under 5 in latest trial Local News Matters Pfizer BioNTech Covid 19 shot loses power against Omicron variant COVID 19 Coronavirus Vaccine: How Does It Affect Your Body? 12 to 15 year olds can now get Pfizer COVID 19 vaccine Pfizer vaccine may offer strong protection after first dose, Israeli study finds
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