When an air bubble enters a vein, it's called a venous air embolism. When an air bubble enters an artery, it's called an arterial air embolism. These air bubbles can travel to your brain, heart, or lungs and cause a heart attack, stroke, or respiratory failure. Air embolisms are rather rare.
hope this helps...prevention of childhood diseases and outbreaks, higher school attendance rates and lower occurances of diseases for families that may heave come in contact with children.