Differential Agglutination Test in Rheumatoid Arthritis complicated by Pneumoconiosis

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Abstract
Among Welsh miners, the differential sheep erythrocyte agglutination test was more often positive in cases of Caplan''s syndrome, progressive massive fibrosis and TB than in normals or those with simple pneumoconiosis. The titers were also higher for rheumatics with massive fibrosis regardless of duration or severity of the rheumatoid arthritis.