Fig. 3From: Differential immunogenicity of BNT162b2 or ChAdOx1 vaccines after extended-interval homologous dual vaccination in older peopleSpike-specific T cell responses after vaccination in donors aged 80+ years. (A) Spike-specific cellular responses following second vaccine with either BNT162b2 or ChAdOxl vaccine measured by ELISpot. Donors with previous natural infection are shown in red. (B) Comparison of cellular responses after first or second vaccine in relation to vaccine subtypeBack to article page