Mumps causes painful swollen salivary glands which are under the jaw, as well as a fever and a headache. Mumps also may cause a serious problem called meningitis or hearing loss. The R in MMR stands for Rubella. Rubella is also called German Measles. It is most dangerous for women who are pregnant.
Rubella is a mild disease in kids.
It may cause the liver to stop working. Chicken Pox Vaccine Chicken pox is a virus. It causes an itchy rash and a fever. You can catch it from someone who already has it if you touch an open blister on that person's skin or if that person sneezes or coughs around you. Not everyone gets the vaccine, so lots of kids still get chicken pox.