Extended Data Fig. 3: Cellular immune responses to Omicron by ELISPOT assays.
From: Vaccines elicit highly conserved cellular immunity to SARS-CoV-2 Omicron

Spike-specific IFN-γ ELISPOT assays at month 1 and 8 following final vaccination with Ad26.COV2.S (N = 20) or BNT162b2 (N = 27). Responses were measured against the SARS-CoV-2 WA1/2020, B.1.617.2 (Delta), and B.1.1.529 (Omicron) variants. Medians (red bars) are depicted and numerically shown.