Matching Pairs Vaccines 101 MatchOnline version Test your knowledge about vaccines with this matching pairs game! Match the concept with its short description. by Vaccines 101 1 Immune Response 2 Side Effects 3 Herd Immunity 4 Immunity 5 Vaccine Clinical Trials 6 Antibodies 7 Antigen Protection against a specific disease. Protection of a population against a particular disease through vaccination. A research study evaluating the safety and effectiveness of a vaccine. Vaccines undergo multiple safety trials before being used in the U.S. Potential reactions that can occur after receiving a vaccine. Indicates that your body is responding to the vaccine. Proteins produced by the immune system to fight off infections. The body's reaction to an antigen or foreign substance, involving the production of antibodies. A substance (usually a protein) that triggers an immune response, leading to the production of antibodies.