This is my opinion and the outcomes we experienced. I am not sure where you are going with this? Please inform me if you would. I never said I am a person that knows everything! I have two family members with cardiac issues. . One of them required a pacemaker. My best friend was exposed to someone who had RSV and almost died. A actually I was the person that heard her gasping for breath . I encouraged her to go to the ER. She was in the ICU for 7 days! She also had pneumonia. Again I am only using my own experience.