The endotoxin core antibody IgM ELISA kit is to be used for the in vitro quantitative determination of endotoxin-core antibodies in serum, plasma and cell culture supernatant. The endotoxin core antibody IgM ELISA kit can be used for different species, like human, rhesus monkey, rat and mouse. However, when using other samples than human, the standard and tracer have to be replaced by a pool plasma of the used species and the right corresponding HRP-labeled antibody.