Abstract

Anti-tetanus toxoid ( tt) antibody (Ig) levels in the supernatant of cultured, pre-immunised equine peripheral blood mononuclear cells ( pbmc) were measured by an indirect enzyme-linked immunoabsorbent assay ( elisa). Optimal anti- tt Ig production occurred at concentrations of stimulating, purified tt of between 0001 and 0·1 μg ml −1, which varied depending on the cell concentration. Optimal anti- tt Ig production was most consistently produced when the cell concentration was 5 × 10 6 ml −1. At this cell concentration maximal anti- tt Ig was induced using 0·1 μg ml −1 tt. At a cell concentration of 5 × 10 6 ml −1 and a tt concentration of 0·1 μg ml −1 anti- TT Ig was first detectable in supernatant on day 5 of stimulation. Maximal levels of anti- tt Ig were present in the supernatant by day 10. No anti- tt Ig was produced in cultures of PBMC from non-immune animals.

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