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UK researchers say

250 items can cause asthma at work
LONDON. May 16: About 250 items, from hairdressers' henna to crabs in canneries, which different categories of workers handle daily on the Job can cause asthma in those allergic to it. researchers say. reports AP.
"Level of exposure is an important risk factor and reduction of exposure Is the only certain method of prevention." Katherine M Venables of London's National Heart and Lung Institute and Moira Chan-Yeung of Canada's University of British Columbia reported.
"Occupational asthma" — asthma contracted at work — "is a potentially fatal condition," they warm in the May 17 issue of the British medical magazine The Lancet, advance copies of which were available Friday.
Asthma Is usually caused by an allergy to ingested substances. It Is characterized by wheezing, coughing and feeling suffocated and Is very common throughout the entire population.
The report said up to 10 per cent of people stiffer from asthma and that an estimated fifth of sufferers in the United States and Japan have it as a result of exposure at work to one or more of the 250 items*
they listed. ’
The list included animal urine that researchers and animal handlers in laboratories are exposed to, grain mites that farmers are exposed to, prawns and crabs in canneries, egg protein. grain dust and wheat and rye flour in bakeries.
Latex, castor beans, green coffee beans, henna, gum acacia used in printing works, and oak. mahogany, western red cedar and some other kinds of wood dust in sawmills were also on the list.
The report said workers allergic to asthma are also at risk from a variety of items used In the plastics, rubber, dyeing, textiles and pharmaceutical industries and in photographic laboratories.
Asthma-allergic health care workers are at risk from penni-cillins and other drugs, engineering workers from oil mists used in tool setting and electronics workers from a substance called colophony used in soft solder flux, it added.
"In surveillance pro-£ammes in the United King-m and in British Columbia, Canada, occupational asthma accounted for 26 per cent and 52 per cent of occupational lung disease, respectively." It said.
"In a British bakery .. the prevalence of work-related chest symptoms was significantly related to a level of current exposure to flour dust."' the report continued.
"During the epidemics of asthma in the enzyme-detergent Industry in the 1960s and 1970s, the rate of sensitisation (to asthma) was highest among workers with high exposure, and it fell steadily after measures to suppress dust were taken."
Explaining how the risk can be passed from one category of worker to another, it said : The hessian sacks used to transport castor beans are recycled for transporting other commodities and for making felt. The sacks contain enough castorbean antigen to sensitise dock workers, and the felt has sensitised furniture workers."
It said an earlier study showed that giving workers respirators to wear did not prevent worsening symptoms of asthma. "Avoidance of exposure is the mainstay of patient management." the present report said. "Ideally, patients should withdraw from the casual exposure permanently, retraining if necessary for alternative employment."