This medication is a combination of vaccines against several virus infections: measles (also known as rubeola), mumps, rubella (also known as German measles), and varicella (also known as chickenpox). These are common childhood infections that may cause serious (rarely fatal) problems. Vaccination... This vaccine contains live viruses that have been weakened. It works by causing the body to produce its own protection (antibodies) against the viruses that cause measles, mumps, rubella, and chickenpox. This combination of vaccines is usually used by children between 12 months and 12 years old. View More Info

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