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. 2023 May 12. Online ahead of print. doi: 10.1016/j.jaip.2023.05.005

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Figure E1 — Products with different expiration dates analyzed for inhibition activity at different dilution factors of immunoglobulin samples using angiotensin-converting enzyme 2 assay against different strains of coronavirus including the Ancestral, Alpha, Beta, Delta, and Omicron strains. Data points represent the percentage inhibition activity for product grouped based on the expiration date. Error bars indicating the standard error of the mean for product with expiration dates ranging between 2023 and 2025.