Log10 50 Percent Embryo Infective Dose

**Semantic type:** Quantitative Concept

**Definition:** A potency unit for measuring infectious activity of a biologic product or infectious agent equal to a base-10 logarithm of amount of product or agent preparation that causes infection in the 50% of embryos (such as chicken embryos) used in the product potency assay or pathogen activity assay.

**Synonyms:** - Log10 50% Embryo Infective Dose - lg EID50 - log 10 50% embryo infective dose - log10 EID50 - log10 EID50