The immunology of asbestosis.

Forty-one employees with varying degrees of asbestosis have been tested for any alteration in the immunological profile. Of these, twenty-two employees showed evidence of pleural thickening and nineteen parenchymal asbestotic fibrosis. Those employees showing pleural thickening gave a strong reaction to different skin tests and a few of those with a parenchymal asbestotic fibrosis showed depressed cutaneous reactivity. Lymphocytotoxic antibodies were present in the sera of 60% of those with pleural thickening and 94% of those with parenchymal asbestosis. An immunological screening schedule is suggested for those employees who show pleural thickening.