Updated on November 8, 2024 Bronchiolitis is an infectious, inflammatory process of the bronchioles. Primarily a disease of the very young (95% of cases occur in children < 2 years old). Always viral. Most commony caused by the Respiratory syncitial virus (RSV). Other causes include parainfluenza, adenovirus, metapneumovirus, bocavirus. Diagnosis is clinical. The transient feature...