The Effects of Agricultural Dusts on Human Health in Shanghai Area.
Shen-E; Ye-T; Dai-Q; Zhou-M; Lu-L
NIOSH 1990 Nov:877-878
Epidemiological studies of the health effects of occupational exposure to agricultural dusts were conducted in the Shanghai area of China. The cohort consisted of 349 rice processors, 259 tea workers, 746 rice farmers, and 497 mushroom farmers. Total dust concentrations ranged from 2.3 to 36.4mg/m3 in the tea mills and 13.2 to 76.9mg/m3 in the rice processing mills. Mushroom compost contained 1.07x10(4) to 4.39x10(5) Thermoactinomycetes colony forming units (CFUs) per gram. Air Thermoactinomycetes concentrations in the mushroom cultivation areas ranged from 262 to 3276CFU per cubic meter. The prevalence of mucous membrane symptoms ranged from 0.8% in mushroom farmers to 63.4% in the tea workers. The prevalence of grain fever in rice processors and rice farmers was 17.5 and 5.1%, respectively. The difference was statistically significant. The prevalence of farmer's lung in rice farmers was 3.5%. The prevalence of mushroom workers' lung in mushroom farmers was 5.8%. The prevalence of chronic bronchitis was highest in male and female rice processors, 17.7 and 9.9%, respectively. One second forced expiratory volume (FEV1), forced vital capacity (FVC), and mid expiratory flow (FEF25/75) decreased significantly over a shift in female tea workers. FEV1, FVC, and FEF25/75 decreased significantly over the cultivation season in mushroom farmers. Serum immunoglobulin-E concentrations were significantly elevated in tea workers. Precipitating antibodies against Thermoactinomycetes- vulgaris and T-candidus were detected in the mushroom workers. The authors conclude that exposure to agricultural dusts is a significant health problem for agricultural workers in the Shanghai area.
Organic-dusts; Occupational-exposure; Epidemiology; Agricultural-workers; Respiratory-system-disorders; Microorganisms; Respiratory-hypersensitivity; Immune-reaction; Industrial-hygiene; Pulmonary-function-tests;
Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Respiratory-system-disorders;
Proceedings of the VIIth International Pneumoconioses Conference