[2] First off - vaccines are #safe and #effective. Full stop. No question about it. Safety has been proven over and over, again and again. (2) A collective base of knowledge, expertise, and experience totaling in terms of centuries goes into each stage. Vaccines are thoroughly tested in a careful, painfully slow process. The number one priority in every step is safety. They don't even test for effectiveness until stage 2 and even then, the primary focus is safety. I really like Wikipedia's short and sweet overview of how clinical trials for vaccines work. (3)
#vaccines #safety #health #research #medicine