Recovery of testicular function among DBCP workers.

Twenty-one men with DBCP-related sperm count suppression were re-examined one year after termination of exposure in July 1977. When examined initially, 12 of these men were azoospermic and nine oligospermic. By October 1978 the sperm count of eight of the nine oligospermic men had improved considerably, six having recovered to a normospermic state. None of the 12 azoospermic men had improved by August 1978. Eleven of the 12 men exposed for more than four years were azoospermic. Serum follicle-stimulating hormone (FSH) for these 11 men increased significantly between assessments. Four children were born to the wives of the nine oligospermic men; three of the children were normal and one had several defects. The significance of this observation cannot be interpreted in terms of DBCP exposure, since this study was not designed to examine pregnancy outcome.