NIOSHTIC-2 Publications Search
New-onset asthma associated with exposure to 3-amino-5-mercapto-1,2,4-triazole.
Hnizdo E; Sylvain D; Lewis DM; Pechter E; Kreiss K
J Occup Environ Med 2004 Dec; 46(12):1246-1252
Objective: The authors conducted an investigation of a cluster of eight new-onset asthma cases identified in a chemical plant through the Sentinel Event Notification Systems for Occupational Risks (SENSOR) program. Methods: Workplace investigation involved interviews with the asthma cases, review of medical records, and medical and industrial hygiene surveys in the plant. Results: Altogether, 11 work-related asthma cases were identified among the plant workers-approximately 10% of the workers exposed to the potential causative agents: 3-amino-5-mercapto-1,2,4-triazole (AMT) or N-(2,6-difluorophenyl)-5-methyl-[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonamide (DE-498; trade name Flumetsulam). Of these cases, six had physician-diagnosed occupational asthma (OA) based on work-related respiratory symptoms and nonspecific bronchial hyperresponsiveness (NSBH), and of these, three had work-related expiratory peak flow changes. Conclusions: The findings of this investigation, together with findings from concurrent animal studies, suggest that this outbreak of new-onset asthma was associated with exposure to AMT. Clinical Significance: A cluster of eight new-onset asthma cases was identified in a chemical plant through the SENSOR program. Subsequent workplace investigation identified AMT, used in the production of a herbicide N-(2,6-difluorophenyl)-5-methyl- [1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonamide, as the most likely causal agent.
Pesticide-industry; Pesticides-and-agricultural-chemicals; Pesticides; Pulmonary-system-disorders; Respiratory-system-disorders; Agricultural-chemicals; Surveillance
Eva Hnizdo, PhD, National Institute for Occupational Safety and Health, MS H-G900.2, 1095 Willowdale Road, Morgantown, WV 26505
Issue of Publication
DRDS; DSHEFS; HELD
Disease and Injury: Asthma and Chronic Obstructive Pulmonary Disease
Journal of Occupational and Environmental Medicine
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division