Figure 2.

Lymphoproliferative responses to inactivated SARS-CoV-2 (B.1/D614G) and SARS-CoV-2 (B.1.617.2/delta): Peripheral blood lymphocytes from naïve (n = 5) and vaccinated (n = 5) monkey groups were cultured in the presence of (A) PHA and (B) inactivated SAS-CoV-2 (D614G/delta) for 96 h, and lymphoproliferation was measured by BrdU incorporation for the last 16–18 h using the Biotrak™ Cell Proliferation ELISA system. Data were analyzed between groups by the non-parametric Mann–Whitney test. The horizontal lines indicate the mean value. *P < 0.05 is considered statistically significant.