Rubella

Infectious Agent

Rubella virus (family Togaviridae, genus Rubivirus) .

Transmission

Person-to-person contact or droplets shed from the respiratory secretions of infected people. People may shed virus from 7 days before the onset of the rash to approximately 5–7 days after rash onset. Transmission from mother to fetus can also occur, with the highest risk of congenital rubella syndrome (CRS) if infection occurs in the first trimester. Infants with CRS can transmit virus for up to 1 year after birth.

Epidemiology

Even though endemic rubella virus transmission was declared eliminated in the Americas in 2015, rubella virus continues to circulate widely, especially in Africa, the Middle East, and South and Southeast Asia. Globally, >100,000 infants are born each year with CRS, and >80% of those are born in Africa and some countries in South and Southeast Asia. In the United States, endemic rubella virus transmission was interrupted in 2001 and elimination was verified in 2004, but imported cases continue to occur. From 2004 through 2015, a median of 9 (range, 3–18) imported cases were reported annually in the United States, and 9 CRS cases were reported during the same period.

Clinical Presentation

Average incubation period is 14 days (range, 12–23 days). Usually presents as a nonspecific, maculopapular, generalized rash that lasts ≤3 days with generalized lymphadenopathy. Rash may be preceded by low-grade fever, malaise, anorexia, mild conjunctivitis, runny nose, and sore throat. Adolescents and adults, especially women, can also present with transient arthritis. Asymptomatic rubella virus infections are common. Infection during early pregnancy can lead to miscarriage, fetal death, or CRS with severe birth defects.

Diagnosis

Demonstration of specific rubella IgM or significant increase in rubella IgG in acute- and convalescent-phase specimens. RT-PCR can be used to detect virus infection; viral culture is also acceptable but is time-consuming and expensive. Rubella is a nationally notifiable disease.

Treatment

Supportive care.

Prevention

All travelers aged ≥12 months who do not have acceptable evidence of immunity to rubella (documented by ≥1 dose of rubella-containing vaccine on or after the first birthday, laboratory evidence of immunity, or birth before 1957) should be vaccinated with measles-mumps-rubella (MMR) vaccine. Before departure from the United States, infants aged 6–11 months should receive 1 dose of MMR vaccine (for measles protection), and children aged ≥12 months and adults should receive 2 doses of MMR vaccine ≥28 days apart on or after the first birthday. MMR vaccine is contraindicated during pregnancy. Pregnant women who do not have acceptable evidence of rubella immunity should not travel to countries where rubella is endemic or areas with known rubella outbreaks, especially during the first 20 weeks of pregnancy, and should be vaccinated immediately postpartum. Health care providers should also ensure that all women of childbearing age and recent immigrants are up-to-date on their immunization against rubella or have evidence of immunity to rubella, because these groups are at the highest risk for maternal-fetal transmission of rubella virus.

CDC website: www.cdc.gov/rubella

Bibliography

  1. CDC. Rubella. In: Hamborsky J, Kroger A, Wolfe S, editors. Epidemiology and Prevention of Vaccine-Preventable Diseases. 13th ed. Washington, DC: Public Health Foundation; 2015. pp. 275–89.
  2. CDC. Summary of notifiable infectious diseases and conditions—United States, 2013. MMWR Morb Mortal Wkly Rep. 2015 Oct 23;62(53):1–122.
  3. Papania MJ, Wallace GS, Rota PA, Icenogle JP, Fiebelkorn AP, Armstrong GL, et al. Elimination of endemic measles, rubella, and congenital rubella syndrome from the Western hemisphere: the US experience. JAMA Pediatr. 2014 Feb;168(2):148–55.  [PMID:24311021]
  4. Reef SE, Plotkin SA. Rubella vaccine. In: Plotkin SA, Orenstein WA, Offit PA, editors. Vaccines. 6th ed. Philadelphia: Saunders Elsevier; 2012. pp. 688–717.
  5. Reef SE, Redd SB, Abernathy E, Kutty P, Icenogle JP. Evidence used to support the achievement and maintenance of elimination of rubella and congenital rubella syndrome in the United States. J Infect Dis. 2011 Sep 1;204 Suppl 2:S593–7.  [PMID:21954252]
  6. Vynnycky E, Adams EJ, Cutts FT, Reef SE, Navar AM, Simons E, et al. Using seroprevalence and immunisation coverage data to estimate the global burden of congenital rubella syndrome, 1996–2010: a systematic review. PLoS One. 2016;11(3):e0149160.  [PMID:26962867]
  7. World Health Organization. Rubella vaccines: WHO position paper. Wkly Epidemiol Rec. 2011 July 15, 2011;86(29):301–16.  [PMID:21766537]

Authors

Emmaculate J. Lebo, Cristina V. Cardemil, Susan E. Reef