Routine of infection Via eustachian tube upper respiratory infection acute rhinonitis and nasal pharyngitis, Upper respiratory communicative disease (diaphea, meals, et al Swimming and dive in unclear water Anatomic contribution (Eustachian tube in infant is wide and short and the two orifice in the same level) 1. Eardrum rcutar canals B Vestibular nerve Note Eustachian tubeRoutine of infection ◼ Via eustachian tube ◼ upper respiratory infection (acute rhinonitis and nasal pharyngitis) ◼ Upper respiratory communicative disease (diaphea, mealse, et al) ◼ Swimming and dive in unclear water ◼ Anatomic contribution (Eustachian tube in infant is wide and short and the two orifice in the same level)