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一位48岁的黑人男性,无特应性体质,在面包房工作9年后,发生哮喘。最先鼻部的症状为喘鸣样发作,通常在工作几小时后出现。皮肤试验显示对粉
A 48-year-old black man with no atopy who developed asthma after 9 years in the bakery. The first symptom of the nose is an outbreak of wheeze, which usually occurs after a few hours of work. Skin test shows powder