The MMR vaccine is specifically designed to provide immunity against Measles, Mumps, and Rubella, which are viral infections with significant morbidity and potential complications. These three diseases share similar modes of transmission and can be effectively prevented by a combined live attenuated vaccine. The MMR vaccine stimulates the immune system to produce antibodies, offering long-term protection, significantly reducing the incidence and outbreaks. This vaccine does not protect against diseases like polio, diphtheria, tetanus, typhoid, hepatitis, or cholera, which require other specific vaccines.

Reference: Harrison's Principles of Internal Medicine, J. Larry Jameson, Edition 20