© 2005 BMJ Publishing Group Ltd
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In many countries occupational asthma is the commonest of all work related respiratory disorders. Thus, evidence based guidelines on its prevention, identification, and management are of the utmost importance to occupational physicians, health and safety practitioners, and public health officials. In this issue, Nicholson et al1 provide such a set of guidelines based on an extensive review of the literature. Altogether, 474 original studies and over 2500 abstracts were considered; the reviewers supply 52 statements scored by two recognised systems for appraising the weight of evidence, and formulate 22 recommendations based finally on data from 223 studies. Some of their key conclusions concern the reduction of airborne exposure to allergens, and the crucial important of health surveillance, early investigation of suspected cases, and complete early avoidance of further exposure in improving the prognosis for established cases. The theme is taken up in an accompanying editorial and in further correspondence from
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