Original articleNatural history of occupational asthma: Relevance of type of agent and other factors in the rate of development of symptoms in affected subjects☆
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2022, Journal of Allergy and Clinical Immunology: In PracticeCitation Excerpt :Early studies usually focused on the difference between HMW and LMW agents, whereas the characteristics of different types of asthmagens within the group of HMW or LMW agents remain to be clarified. For example, the mean latency (between exposure and first occurrence of symptoms) of isocyanate asthma was more comparable with that of OA caused by HMW agents than that of OA caused by western red cedar, another LMW agent.12 Although the latency may also be partly influenced by different exposure modes, for example, vapor/particulate, or the availability of the antigen, our finding may suggest that “LMW agents” consist of a heterogeneous group with different clinical patterns depending on the type of the chemical.
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Supported by the Workers' Compensation Boards of Quebec and British Columbia.
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J.L. Malo is a research fellow with the Fonds de la Recherche en Santé de Québec and the Université de Montréal School of Medicine. J.L. Malo and M. Chan-Yeung are members of the Canadian Network of Excellence in Respiratory Health.