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 Antigen 2 Immunity 3 Antibodies 4 Vaccine Clinical Trials 5 Herd Immunity 6 Immune Response 7 Side Effects Potential reactions that can occur after receiving a vaccine. Indicates that your body is responding to the vaccine. A substance (usually a protein) that triggers an immune response, leading to the production of antibodies. 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. The body's reaction to an antigen or foreign substance, involving the production of antibodies. Protection against a specific disease. Proteins produced by the immune system to fight off infections.