Viral infections are closely linked to wheezing illnesses in children of all ages. Respiratory
syncytial virus (RSV) is the main causative agent of bronchiolitis, whereas rhinovirus (RV) is
most commonly detected in wheezing children thereafter. Severe respiratory illness induced
by either of these viruses is associated with subsequent development of asthma, and the risk
is greatest for young children who wheeze with RV infections. Whether viral illnesses
actually cause asthma is the subject of intense debate. RSV-induced wheezing illnesses …