Vaccine - A biological preparation that improves the immune system’s ability to recognize and destroy harmful infectious agents.⏎
Tissue Culture - The process by which tissues are intentionally grown under controlled conditions.⏎
Yeast - A broad group of microscopic fungi that includes harmless forms of yeast used in baking and alcoholic fermentation as well as pathogenic species that can cause disease. ⏎
Virus - An infectious agent that is only capable of replicating itself inside the living cells of other organisms.⏎
White Blood Cell - A special type of cell that works as part of the immune system to defend the body against disease and infection.⏎