This is a very technical question that is better answered by someone with a lot better scientific and clinical background than I have, however for lack of seeing anyone with those qualifications...
Vaccines are created by taking a sample of whatever you want to prevent and heating it up just enough to kill it or severely weaken it. When that is injected in a person, their immune system will...
Vaccines inject a weak amount of the pathogen that causes the infection into you. This is not enough to harm you. This causes your bodies lymphocyte white blood cells to produce antibodies that lock...