a within 14 days after first day of illness.
b respiratory allergy is the clinical presentation, in particular rhinitis, asthma and COPD, resulting from an allergic reaction of the respiratory tract following inhalation of a (bio)chemical allergen.
OR= odds ratio; NA = not available; NH+ZH = Noord- and Zuid-Holland;
'p>0.05 for all differences in course and severity between patients with a resistant virus and patients with a sensitive virus and age in 2 categories (17 years and younger and 18 years en older).