I read with interest the article on "Bad Flu Shots" Last year I had a flu shot which I am convinced was either a bad flu serum or a bad injection. A nurse practitioner injected me not on the outer part of my upper arm, but the inside of my arm very high on the shoulder. Shortly after, I developed a severe pain in my neck, shoulder, arm and forearm. I generally have a high tolerance for pain, but this was quite severe. I called my doctor's office and they prescribed two potent drugs, and I couldn't function from the grogginess it produced. Ironically, I had an appointment with a heart specialist at the Lahey Clinic. When I explained my symptoms to her, she kept me overnight in order to out rule angina or other heart ailment. When coming back home, I was still experiencing severe pain, saw an orthopedic doctor. He diagnosed me with "massive rotator cuff". Gave me a cortisone injection, took me off the pain meds and prescribed pt. I couldn't get an appointment with pt right away, so I did some exercises I had done in the past when I actually did have a rotator cuff tear. In less than 2 weeks, the pain subsided. After having pt for a rotator cuff tear, I knew they never resolved that quickly. When reading the article, it confirmed my suspicions and I will never get a flu shot again. Hope this helps others. Granjan