Acute inflammatory exudate occluding the lumen of the bronchiole and acute inflammation of part of the wall of the bronchiole The term usually refers to acute viral<unk> , a common disease in infancy. This is most commonly caused by respiratory syncytial virus (RSV, also known as human pneumovirus). Other agents that cause this illness include human metapneumovirus, influenza, parainfluenza, coronavirus, adenovirus, rhinovirus and mycoplasma. Risk factors Children are at an increased risk for progression to severe respiratory disease if they have any of the following additional factors: * Preterm infant (gestational age less than 37 weeks) * Younger age at onset of illness (less than 3 months of age) * Congenital heart disease * Immunodeficiency * Chronic lung disease * Neurological disorders * Tobacco smoke exposure
Bronchiolitis
Heart failure
Bronchitis
Asthma
Bronchitis kettle
Pneumonia
Croup
Cystic fibrosis