Pattern of Airway Response to Allergen Extract of <i>Phleum pratensis</i> in Asthmatic Patients during and outside the Pollen Season

In order to evaluate the pattern of airway response to a specific bronchial provocative test (sBPT) with an extract of Phleum pratensis standardized in biological units (BU), we studied 27 patients with seasonal asthma due to grass pollen by means of allergologic evaluations, methacholine inhalation test and sBPT, outside the pollen season in all patients and, in 10 of them, also during the pollen season. We used a DeVilbiss 646 nebulizer with a...