Effects of occupational exposure to residual fenitrothion amongst workers in the Malaria Control project in Dar esSalaaam

This study was conducted with the objective of monitoring the effects of f enitrothion exposure on health of workers. A total of 297 workers in the Malaria Control Project in Dar es Salaam were examined for cholinesterase enzyme activity depressions and for occurrence of symptoms of exposure. Evidence of fenitrothion overexposure in our environment appeared early among 10 (3.4%) workers, 7 of which developed severe symptoms within 2 weeks and were promptly rested. Overall 70 (23.6%) workers had significant cholinesterase depressions; and 82 (27.6%) individuals developed symptoms of exposure in 8 weeks of spraying; indicating obvious toxic effects of the pesticide. Occurrence of symptoms had a significant relationship to cholinesterase depressions. The groups of workers most affected were mixers and spray men; while supervisors, drivers and others were least affected. This showed differential effects according to the occupation. Other related factors to the overexposure, like incomplete protective gear, inadequate close supervision of spray men on handling the pesticide and personal hygiene were pointed out. Recommendations on ways to improve the situation and ultimately avoid adverse effects for better workers' health are put forward.