A Study To Investigate The Effect Of Inhaled Fluticasone Propionate On The Bronchial Responsiveness To Leukotriene D4 In Asthmatics Patients

Inclusion: * Diagnosed history of asthma * Non smoker last two years * \< 5 pack years * FEV1 \>70% of predicted * Mild and stable asthma * Only using short acting b2-agonist as rescue for the last 4 weeks * Have a history of atopy. Exclusion: * Any significant respiratory disease, other than asthma * Subjects with seasonal asthma may not be included if they are in their season * Use of oral or inhaled glucocorticosteroid for the last 3 months and long-acting or oral b2-agonists, anticholinergic bronchodilators, cromones, antihistamines, theophyllines and antileukotrienes within two weeks * Upper or lower RTI within 6 weeks * Evidence of any disease that in the investigators mind would affect the results of the study * Participating in another study within 4 weeks * Females who are pregnant, intend to be or who are lactating * Methacholine PD20 \> 454mcg * Negative scin prick test