Fig. 2From: Immunogenicity and safety of heterologous versus homologous prime-boost schedules with an adenoviral vectored and mRNA COVID-19 vaccine: a systematic reviewEstimates of risk ratio of reactions stratified by any, local, and systematic reactions. Figure shows the risk ratio of any, local, and systemic events in participants who received heterologous ChAd/BNT schedule compared with those in homologous ChAd/ChAd (A) and the risk ratio of any, local, and systemic events in participants who received heterologous ChAd/BNT schedule compared with those in homologous BNT/BNT (B). BNT BNT162b2 vaccine, Pfizer–BioNTech, ChAd ChAdOx1 nCoV-19 vaccine, AstraZeneca, CI confidence intervals, RR risk ratioBack to article page