How on earth does a vaccine prevent disease. Sometimes its the cure, but for more common purposes which includes but not limits to the flu shot. Which trains your body to kill the virus. Then the all the immune cells who worked on killing the training virus, kill themselves, and only the memory cells survive. So in case real viruses invade, the memory cells tells the immune systems how to stop the infection. So in a way, I was right. Also, attacking my parents is way out-of-line. Even for me. I wouldn't do that. I don't care what you parents taught you. But the main point of my statement is this: Vaccines are an invention that everybody should utilize to help put a stop on disease. Cheerio lummox.