CD79A and rheumatoid arthritis: To test this hypothesis, IgG and IgA antibody responses against pathogenic components of three strains of bacteria were determined for sera from two groups of RA patients, who met RRP criteria and non-RRP, and normal (NL) controls by ELISA using the ChonBlockTM buffer system, which prevents virtually all types of non-specific reactions involved the indirect ELISA as reported [13].