The MMR vaccine is a combined measles-mumps-rubella inoculation. It contains the safest and most effective form of each vaccine. You are considered immune to mumps if you’ve had the infection before or if you’ve been immunized with the MMR vaccine. But a single dose of the vaccine does not offer enough protection during an outbreak. So its important to ensure you receive two doses of the MMR vaccine.  The recommendation of the second dose did not begin until the late 1980s or early 1990s. So many young adults may not have received a second dose of the vaccine. If you are an adult, talk to your doctor about the number of vaccines for mumps you have received and ensure you are given both doses. Two doses of the MMR vaccine are recommended before a child enters school. The first one should be given between 12 and 15 months old. The second one should be given between 4 and 6 years old. Though the initial shot for the vaccine may be a bit painful, most people do not experience any serious side effects from the vaccine. In fact, less than one out of 1 million doses causes a serious allergic reaction.  Despite fairly prevalent internet rumors due to a discredited study, the MMR vaccine does not cause autism. If your doctor runs a blood test and confirms you are immune to measles, mumps and rubella, you do not need the vaccine. As well, if you have already been given two doses of the vaccine, you normally do not need to be vaccinated again.   In the case of a severe outbreak, a physician may recommend that you receive a third dose to “boost” your immunity.  The vaccine is not recommended for women who are pregnant or plan to get pregnant within the next four weeks. It is also not recommended for individuals who have a life-threatening allergy to gelatin or antibiotic neomycin. Check with your doctor before getting vaccinated if you have cancer, a blood disorder or HIV/AIDS. Talk to your doctor before getting vaccinated if you’re taking steroids or other drugs that affect your immune system. When you sneeze or cough,...

TL;DR in Chinese:
确保你接种了两剂麻腮风三联疫苗（MMR）。 了解哪些情况不需要接种MMR疫苗。 养成良好的卫生习惯，像是勤洗手和用纸巾。