The present invention is directed to a novel method for preventing or treating the development of respiratory allergies. The method comprises prenatal and/or postnatal administration of a therapeutically effective amount of LGG.本發明係關於預防或治療呼吸道過敏發展的方法。此方法包含出生前及/或出生後投服一治療有效量之乳酸桿菌GG(LGG)。