Nasal spray vaccines are a type of vaccine delivered through the nose rather than by injection. They work by introducing a weakened or inactivated form of a virus or bacteria, stimulating the immune system to recognize and fight the pathogen if exposed in the future. This method can be more comfortable and easier to administer, especially for children. One well-known nasal spray vaccine is the FluMist, which protects against the influenza virus. These vaccines can provide a quick immune response and are designed to target respiratory infections, making them a valuable option in public health efforts.