Detection of norovirus in respiratory secretions in children with respiratory tract infection.

To evaluate whether norovirus (NoV) can be a possible cause of respiratory tract infection, 562 nasopharygeal samples collected from children admitted for influenza-like illness were tested for NoV. Three (0.5%) were positive NoV GII.4. The data show that NoV can be found in the respiratory secretions of children with respiratory symptoms and that respiratory involvement can precede gastrointestinal manifestations.