Table E1.

Effect of OM-85 on human ACE2 expression by ACE2/HEK293T cells

	PBS	OM-85
ACE2/HEK293T	99.3 ± 0.3	99.4 ± 0.1

Cells were treated with PBS or OM-85 (1.92 mg/mL) for 72 hours, and human ACE2 expression was evaluated by flow cytometry with an AF647-conjugated antihuman ACE2 antibody or isotype control. Data are shown as mean percentages ± SE of ACE2-positive cells in PBS- or OM-85–treated cultures (n = 3/condition). Negligible proportions of positive cells were detected in the isotype control samples.