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[Comparative study of immunoglobulins and specific antibodies in the sera of chronic brucellosis patients].

The data on the IgA, IgM and IgG levels in the sera of 89 patients with chronic brucellosis lasting for 1-10 years and longer are presented. The chronic form of brucellosis is characterized by the normal or low level of immunoglobulins. No correlation between the levels of IgG, IgM and the titer of specific antibodies has been established.