96 well MicroWell MaxiSorp flat bottom plates (Sigma-Aldrich) were coated with 2μg/ml of antigen (CII, Sigma-Aldrich)) and incubated overnight at 4°C. The following day the plates were washed and blocked. Serial serum dilutions were added to the plates and incubated overnight at 4°C. The next day, plates were incubated with anti-mouse IgG1, IgG2a, IgG2b, IgG3 and IgM isotypes coupled to Horse Radish peroxydase (Lo-Imex, Louvain, BE), revealed using a TMB kit (BD Biosciences) and read at 450nm using a ELISA plate reader [15 (link), 16 (link)].
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