OM-85 BV for primary prevention of recurrent airway infections: a pilot randomized, double-blind, placebo-controlled study.

OM-85 BV was not effective in the primary prevention of respiratory tract infections. Although most authors recommend the use of this immunostimulant in children with a history of recurrent respiratory infections, more studies are needed to define its usefulness in the primary prevention of respiratory infections in healthy children exposed to few risk factors.