Vaccine Preventable Diseases
Measles, Mumps and Rubella
Advisory Committee on Immunization Practices (ACIP) Recommendations
Infants and Children
- All children without contraindications should receive two doses of measles-mumps-rubella combination vaccine (abbreviation: MMR; trade name: M-M-R II®) after 1 year of age and at least 4 weeks apart. The first dose is usually administered at a minimum of 12 months of age, and is generally given between 12 and 15 months of age. The second dose is usually given between 4 and 6 years of age, prior to entering school, although it can be given anytime at least 4 weeks after the first dose for children at increased risk of exposure.
- The CDC recommends that MMR and varicella vaccine (trade name: Varivax®) be administered separately for the first dose in order to reduce the small increased risk of febrile seizures in toddlers associated with the measles-mumps-rubella-varicella combination vaccine (abbreviation: MMRV; trade name: ProQuad®) compared to the separate but simultaneous administration of MMR and varicella vaccines. MMRV is generally preferred for the second dose.
- One dose of MMR should be administered to all adults 18 years of age and older without evidence of immunity to these diseases (acceptable evidence of immunity includes documentation of previous receipt of MMR or MMRV vaccine, laboratory confirmation of immunity or disease, or having been born before 1957). Two doses separated by at least 4 weeks are recommended for adults at high risk for exposure and transmission (such as international travelers; college students; and health care personnel) [1, 2].
For More Information
ACIP recommendations: http://www.cdc.gov/vaccines/hcp/acip-recs/
Immunization schedules: http://www.cdc.gov/vaccines/schedules/index.html
Measles is a highly contagious acute disease caused by an RNA paramyxovirus, genus
Morbillivirus, with one antigenic type. Measles is transmitted via the respiratory route and secondary attack rates in families among susceptible persons are often greater than 90%. Measles virus can survive up to 2 hours in air or on surfaces. The average incubation period of 10-12 days is followed by cough, runny nose, and stepwise increase in fever up to 103-105°F. A maculopapular rash begins on the face and head a few days after onset of respiratory symptoms and persists for 5-6 days. Common complications include diarrhea, otitis media, and pneumonia, and rare complications include encephalitis, seizures, and death. Measles illness during pregnancy increases the risk of premature labor, low-birthweight children, spontaneous abortion, as well as pneumonia and encephalitis.
Mumps is caused by an RNA paramyxovirus with one antigenic type and is acquired through respiratory transmission. The incubation period is 12-25 days. Symptoms are generally nonspecific at first, including myalgia, malaise, headache, and fever. Approximately one-third of mumps infections are asymptomatic; however, asymptomatic persons can transmit the virus. Possible complications of mumps infection include parotitis, orchitis, oophoritis, deafness, meningitis, encephalitis, and pancreatitis.
Rubella, also known as “German measles”, is caused by an RNA togavirus, genus Rubivirus, with one antigenic type. Rubella is acquired through respiratory transmission and the incubation period is about 14 days. Symptoms include mild fever and malaise; up to 50% of cases are subclinical. A maculopapular rash lasting about 3 days generally occurs 14 to 17 days after infection, beginning on the face and spreading downwards. This rash is usually fainter than the measles rash, and does not coalesce. Arthralgia and arthritis are common after puberty, especially in females .
Measles, mumps and rubella vaccines are all live attenuated viral vaccines that are only available in combination as MMR in the United States. The MMRV vaccine also includes varicella vaccine .
Vaccine Effectiveness: One dose of MMR vaccine is estimated to be 93% effective in preventing measles, 97% effective in preventing rubella, and 78% effective in preventing mumps. A second dose has been shown to increase the effectiveness of measles and mumps vaccine to an estimated 97% and 88%, respectively, mainly by producing immunity in those who failed to respond to the initial dose [1-3].
Vaccine Safety: Mild illness in people receiving their first dose of MMR can occur due to replication of the attenuated measles vaccine virus. Between 5% and 15% develop a 1-2 day fever up to 103°F approximately 7 to 12 days after the first dose. A transient rash may also appear during this time frame, occurring in approximately 5% of those vaccinated .
Vaccines which may induce fever may also rarely induce febrile seizures. Febrile seizures are a common and typically benign childhood condition, occurring in 2-5% of children at some point during their first five years of life. Febrile seizures have an estimated background incidence of 240–480 per 100,000 person-years in children under five years, although this varies considerably by age, genetics, co-morbidities and environmental risk factors. There are no long-term effects of simple febrile seizures, with the possible exception of an increased risk of recurrence [4-7]. Febrile seizures occur at a rate of about 1 per 2,500 doses of MMR and 1 per 1,250 doses of MMRV in children 12-18 months of age . The slightly higher rates of fever and febrile seizures in children between 1 and 2 years of age when receiving MMRV vaccine as opposed to MMR and varicella vaccine separately is not seen in children receiving their second dose between 4 and 6 years of age . See the Do Vaccines Cause Seizures summary for more details.
Mild, acute joint symptoms occur in approximately 25% of susceptible adult women after rubella vaccination, but are less common in men and rare in children. See the Do Vaccines Cause Arthralgia or Arthritis summary for more details.
Rare adverse events from MMR vaccine include thrombocytopenia, parotitis, lymphadenopathy and encephalopathy. Very rare adverse events from MMR vaccine include measles inclusion body encephalitis (MIBE). Immune thrombocytopenia purpura (ITP) occurs after approximately 1 in 30,000 doses. Allergic reactions are also rare. See the Do Vaccines Cause Immune Thrombocytopenic Purpura, the Do Vaccines Cause Meningitis or Encephalitis, and the Do Vaccines Cause Anaphylaxis summaries for more details.
There is convincing evidence that MMR does not cause autism . See the Do Vaccines Cause Autism summary for more details.
Contraindications and Precautions: Severe allergic reaction (e.g. anaphylaxis) to a previous dose or vaccine component such as neomycin is a contraindication to further vaccination with MMR. Other contraindications include pregnancy and immunosuppression. Current moderate to severe acute illness is a precaution to any vaccination. Other precautions for MMR vaccination include recent receipt of antibody-containing blood products and personal or family history of seizures .
Considerations for Women of Child-Bearing Age: Measles, Mumps and Rubella are all live attenuated vaccines and are contraindicated during pregnancy.
Among pregnant women who are infected with wild-type rubella virus, transplacental infection of the fetus can occur, causing congenital defects or stillbirth. Congenital Rubella Syndrome (CRS) can include deafness, cataracts, heart defects, neurologic abnormalities including severe retardation, autism, bone alterations, and liver and spleen enlargement. Infants with CRS may shed rubella virus for longer than a year. The greatest risk for congenital malformations from rubella is associated with infection in the first trimester, with as many as 85% of such infants affected. In contrast, congenital malformations are rare when the infection occurs after the 20th week of gestation. The 1964-65 rubella epidemic was associated with an estimated 20,000 cases of congenital malformations, with deafness and heart disease the most common.
Vaccination against rubella is emphasized for all non-pregnant women of childbearing age, especially those born outside of the United States. Rubella immunity should be verified by their health care providers either by documentation of at least one dose of rubella-containing vaccine given after the first year of life or by serology. Those without such evidence of immunity should be given MMR vaccine, excluding women who are pregnant or currently attempting to become pregnant (pregnancy should be avoided for at least 4 weeks following MMR vaccination). ACIP recommends that providers of MMR vaccine ask women if they are pregnant or likely to become pregnant in the next 4 weeks; those who respond “yes” should be excluded from vaccination, and those who respond “no” should be informed of the theoretical risks of MMR vaccination during pregnancy and the corresponding importance of not becoming pregnant during the 4 weeks following vaccination, and then vaccinated. Routine pregnancy screening before vaccination is not recommended.
If a pregnant woman is inadvertently vaccinated or becomes pregnant within 4 weeks after MMR vaccination, she should be counseled again as to the theoretical risks, but this should not be considered an indication for termination of the pregnancy. The theoretical concerns regarding MMR vaccination during pregnancy stem from the fact that MMR is a live attenuated viral vaccine and wild-type rubella virus is known to be teratogenic as described above. The CDC followed women who were vaccinated against rubella during pregnancy from 1971 to 1989 through the Vaccine in Pregnancy (VIP) Registry. Although subclinical fetal infection was detected serologically in about 1-2% of their infants, the VIP Registry showed no evidence of the occurrence of CRS [1, 2]. The CDC estimated the theoretical risk of CRS following rubella vaccination during pregnancy to be between 0% and 1.6% . More recent studies have also found no evidence of CRS in women who were vaccinated while unknowingly pregnant [10-13]. However, because a small risk cannot be entirely ruled out, women should not be given MMR vaccine during pregnancy.
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12. Soares RC, Siqueira MM, Toscano CM, et al. Follow-up study of unknowingly pregnant women vaccinated against rubella in Brazil, 2001-2002. The Journal of infectious diseases 2011;204 Suppl 2:S729-36.
13. da Silva e Sa GR, Camacho LA, Stavola MS, Lemos XR, Basilio de Oliveira CA, Siqueira MM. Pregnancy outcomes following rubella vaccination: a prospective study in the state of Rio de Janeiro, Brazil, 2001-2002. The Journal of infectious diseases 2011;204 Suppl 2:S722-8.