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Clinicians caring for patients with asthma and allergic diseases have known for several years that major changes are occurring in the diagnosis and treatment of asthma and allergy. First of all, for reasons that are not entirely clear, the prevalence of these diseases has increased strikingly in the past decade. Asthma now affects 5 to 8 percent of the population, and in some areas of the country, as many as 10 to 15 percent of people have asthma. Second, a concerted international effort is afoot to improve the overall effectiveness of asthma care. Finally, a host of new medications for
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