PDCD1 and infection: Consequently, less Lm-infected hMDDCs were observed in the presence of PBLsPHA (42.02 ± 9.17%) and PD-1 blockade dampened the infection rate of hMDDCs the most (24.68 ± 8.15%), compared to hMDM1 and hMDM2 (Figure 2C).