What form do vaccines typically come in?

Vaccines are most commonly available in injectable solutions. This method of administration allows the vaccine to be delivered directly into the bloodstream or muscle tissue, where it can effectively stimulate an immune response. The injectable form ensures that the antigens in the vaccine are properly processed by the immune system, helping the body to develop immunity against specific diseases.

While there are oral vaccines and some innovative formulations, such as nasal sprays for specific influenza vaccines, the majority of widely used vaccines are designed to be given via injection. This delivery system is crucial for many vaccines as it ensures proper absorption and efficacy. Other forms like oral tablets or topical creams are not standard for vaccines, which are specifically engineered to achieve maximum effectiveness through injection.