The present paper is to determine the relationship between the leve! of knowledge and practicas on Acute Respiratory lnfections (ARI) in mothers of children less than five years of the health center Morales. October to December 2011, because in Peru, the IRA is an important public health problem, ranking first among the causes of morbidity in children under 5 years. lt is an applied study, descriptive - correlational cross-sectional multimethod focused. fhe sampie consisted of 69 mothers who met the inciusion criteria, iess probabilistically to 95% confidence. Far data collection a questionnaire was developed that consisted of 30 items to measure the variables are assigned a score to the mothers' responses to both knowledge to practica. lt also conducted a focus group, which helped strengthen and complement the characteristics of the study. The interviews were taped and transcribed. The ...