The MMR vaccine is a hybrid vaccine used to prevent three infectious diseases, including measles, mumps, and Rubella. The vaccine is usually administered in two doses in childhood.
< br>1) measles: a viral disease that causes fever, cough, skin rashes, and respiratory problems and can cause serious complications such as pneumonia, brain inflammation, and even death.
2) mumps: a viral disease that causes swelling of the salivary glands and can lead to complications such as inflammation of the testicles in men and inflammation of the ovaries in women.< br>3) rubella: a viral disease that for adults usually has mild symptoms, but can damage the fetus during pregnancy, causing birth defects such as blindness and heart defects.

This vaccine is usually given to children at the age of 12 months and again at the age of 4-6 years. The MMR vaccine is widely prescribed in many countries to prevent these diseases and is usually safe and effective.