A comparative study was carried out between the divisions of one of the viscose industry plants where workers carry on shift work in CS2 exposure and shift workers of a wool industry plant--in the same town--with no chemical exposure. It appeared that more of the CS2 exposed workers became disabled at a younger age and after shorter employment duration. As to the diseases resulting in the untimely job leave most frequent were stenocardia, accidents and tumours; on the other hand no such observations referred to diabetes mellitus and obliterative inflammation of lower extremities arteries. Chronic obturative disease nervous system diseases and hypertension, and, to a lesser degree, predominated among wool industry workers.