The article discusses the concept of a universal vaccine that could protect against all diseases. It focuses on the development of a universal flu vaccine that could protect against all strains of the flu, including future ones. The article explores the challenges in vaccine development, the design of a universal vaccine, and emerging science in the field. While a fully universal vaccine against all infectious diseases is currently beyond our reach, the article suggests that advancements in medical technology could bring us closer to this goal in the future.