Conclusions
The results of this research confirm that patients with low specific IgA levels present more frequently: general malaise, cough and thoracoabdominal dissociation. Low levels of RSV-specific IgA in the airways are statistically and clinically related to increased severity of RSV infection. Clinical variables such as the low oxygenation index, the presence of crackles and wheezing, of pediatric patients with RSV infection are more common in those who did not breastfeed for 6 months. Breastfeeding is a protective factor to avoid developing a severe picture of RSV pneumonia and with it, the potential death, so it should be considered as a powerful preventive weapon.