['seasonal allergic rhinitis']
['bifidobacteria', 'placebo']

        Inclusion Criteria:

          -  Children of both sexes , aged from 4 to 17 years

          -  History seasonal allergic rhinitis mild , moderate or severe , according to the
             guidelines defined AIR 2013 , documented by recurrent episodes in the previous year
             and confirmed by skin prick test positive

          -  Written informed consent of one parent or a legal representative

        Exclusion Criteria:

          -  Lack of written informed consent by at least one parent or a legal representative

          -  Concurrent disorders such as infection of the upper or lower respiratory tract , nasal
             surgery in the past year , respiratory tract abnormalities , immune diseases

          -  Use of antihistamines , nasal or systemic corticosteroids , leukotriene modifiers , or
             cromolyn sodium , on an ongoing basis used in the last six weeks.
      