A vaccine is a suspension of weakened, killed, or fragmented microorganisms or toxins or other biological preparation, such as those consisting of antibodies, lymphocytes, or mRNA, that is administered primarily to prevent disease., Vaccination is a simple, safe, and effective way of protecting you against harmful diseases, before you come into contact with them. It uses your body’s natural defenses to build resistance to specific infections and makes your immune system stronger., There are several different types of vaccines. Each type is designed to teach your immune system how to fight off certain kinds of germs—and the serious diseases they cause. When scientists create vaccines, they consider: Based on a number of these factors, scientists decide which type of vaccine they will make., Vaccine information includes a listing of vaccines approved for marketing, questions about vaccines, vaccine safety and availability, and vaccine-related guidance documents, notices, and, A vaccine, or immunization, schedule lists which vaccines are recommended for different groups of people. It includes who should get the vaccines, how many doses they need, and when they should get them., VISs VIS Translations Travel Vaccines Vaccine History Timeline CDC Recommended Schedules ACIP Vaccine Recommendations.