Table 1.

Minimum concentrations of recombinant spike protein (ng/µL) needed to induce HA when added to RBC solution, and concentrations of IVM (µM) needed to inhibit or reverse this induced HA. Tests to determine these values were each done in triplicate.

Variant	Minimum Spike Protein Concentration to Induce HA (ng/µL)	Highest Spike Protein Concentration Tested for HA (ng/µL)	Minimum IVM Concentration to Inhibit HA at Highest Spike Concentration (µM)	Minimum IVM Concentration to Release HA at Highest Spike Concentration (µM)
Wuhan	1.06	2.12	1	1
Alpha	1.06	2.12	1	1
Delta	1.06	2.12	1	2
Omicron	0.13	0.53	1	2