Figure 1.

Pseudovirus bearing Delta variant spike protein infects ACE2^low HBEpC to a higher level than other variants. HBEpC from 12 different donors were measured for surface expression of ACE2 by flow cytometric analysis and plotted on the x‐axis from low to high. The corresponding infectivities of an equal amount of pseudoviruses bearing the original Wuhan‐Hu‐1, Alpha, Beta, Gamma, and Delta variant spike protein on cells from each donor are plotted on the y‐axis. Statistical analysis was performed using two‐way ANOVA, *p < 0. 05, **p < 0.01, ***p < 0.001