WHO warns individuals against mixing and matching COVID vaccines | Reuters
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
A mix-and-match approach to COVID-19 vaccines could provide logistical and immunological benefits | PBS NewsHour
What the World Health Organization really said about mixing COVID-19 vaccines | CBC News
Chart: Mix & Match Approach to COVID Vaccines is Paying Off | Statista
Mix-and-match COVID vaccines ace the effectiveness test
COVID-19 Vaccines Advice
EU backs mix-and-match vaccines – DW – 12/07/2021
How effective are mix-and-match vaccines against COVID-19?