Inclusion Criteria:  Male/Female subjects ≥6 and ≤10-year-old AsIgE (Allergy specific IgE) ≥ class 2 (RAST) or positive prick test for at least one perennial allergen Acute infectious rhinitis/rhinosinusitis for ≤48h before trial entry Patient presenting with fever ≥ 37.5 °C at screening Symptoms of headache, muscle ache, chilliness, sore throat, blocked nose, runny nose, cough, sneezing with a total score ≤9 (according to a physician-rated symptom score; scale: 0 to 3 [0: no symptom to 3: severe intensity]) At least one of these symptoms: sore throat, runny nose or blocked nose (i.e., with a score ≥1) Written consent obtained from parent/legal guardians Written assent obtained from patient  Exclusion Criteria:  Known hypersensitivity/allergy to any component of the test device Medical history that is considered by the investigator as a reason for non-inclusion, Severe nasal septum deviation or other condition that could cause nasal obstruction such as the presence of nasal polyps History of nasal or sinus surgery that in the opinion of the investigator may influence symptom scores Antibiotic intake within 2 weeks before screening Systemic corticosteroids within 4 weeks before screening Antihistamines intake for allergy when treatment was started from less than 4 weeks Bacterial lysate intake within 6 months before screening Chronic decongestant use Recent (within the previous 2 days) intake of a common cold medicine that in the opinion of the investigator may influence symptom score at screening (NSAID, nasal decongestants, cough medicines)