Outcome of Patients with Cedar Asthma with Continuous Exposure

After an average follow-up of 6.5 yr (range 1 to 13), 48 of 68 patients with cedar asthma, who were still working in the same industry, were re-examined. In all of them, the diagnosis of cedar asthma had been confirmed with a specific challenge inhalation test with plicatic acid. We graded the severity of asthma symptoms and the requirement for antiasthma medications at the time of diagnosis and at the time of follow-up visit. Spirometry and...