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A mix-and-match approach to COVID-19 vaccines could provide logistical and immunological benefits | PBS NewsHour
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Explainer: What's the best mix of Covid-19 vaccines and boosters? Early indications and studies may shed some light - TODAY
European Commission - Vaccinate, vaccinate and boost! Evidence gathered by the European Medicines Agency and the European Centre for Disease Prevention and Control (ECDC) suggest that mRNA vaccines used as boosters 3
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