NACI recommends Pfizzer of Moderna for people who received AstraZeneca as first COVID-19 vaccine shot
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Canada’s chief public health officer Dr. Theresa Tam announced on Thursday that the National Advisory Committee on Immunization (NACI) has updated its guidance for people who received an AstraZeneca COVID-19 vaccine first shot to recommend receiving an mRNA vaccine as a second shot, either a Moderna or a Pfizer vaccine, citing an emerging evidence on potentially better immune response with this mixed vaccine schedule.