A Pilot Study for the Determination of Allergenicity of Cat Dander Samples Obtained by Different Methods

Inclusion Criteria: * Written informed consent * Male or female between 18 years to 65 years * A positive clinical history with inhalant allergy presumably due to cat allergen. * Positive screening prick test (mean wheal diameter ≥ 3 mm) when tested with already standardized cat allergen extract. * Positive screening prick test (wheal diameter ≥ 3mm) to Histamine dihydrochloride 10mg/ml. Exclusion Criteria: * Impaired in understanding the nature, meaning and scope of the study or incapable of giving written informed consent, * Participation in another clinical trial within the last 30 days and during the present study, * Pregnant or lactating women, * Positive skin reaction in the screening prick test to negative control, * Currently suffering from allergy symptoms, * History of systemic reactions to allergens, * Severe diseases influencing the results of the present study by discretion of the investigator, * Immunotherapy with the allergen preparation during the past two years, * Skin lesions and excessive hair-growth in the skin test areas, * Treatment with prohibited concomitant medications according to section 9.3 (protocol) with the exception of medications with local effects which will not influence the results of the skin tests, * Alcohol or drug abuse.