Measles, Mumps, and Rubella all combined into one vaccination.
Measles- this virus causes rash, cough, runny nose, eye irritation, and fever. It could lead to ear infections, pneumonia, seizures, and brain damage.
Mumps- this virus causes fever, headaches, muscle pain, loss of appetite, and swollen glands. It could lead to deafness, meningitis, painful swelling of testicles or ovaries.
Rubella (German Measles)- can cause rash, arthritis (mostly in women) and mild fever.
These diseases can spread from person to person through air, it can easily be caught by being around someone who is already infected.