Respiratory syncytial virus (RSV
a virus that can cause severe pulmonary infections in infants
. The effects of this, especially in the still developing lungs after birth, can take a long time from which to recover. However, you have a special circumstance that complicates things: you live at significant altitude. The relative lack of oxygen at that altitude can lead to elevated blood pressure across the lungs, which is called pulmonary hypertension.