Colleen M. Kennedy et al ACKNOWLEDGMENTS The study was funded in part by the National Institute of Child Health and Human Development (NICHD) 1K23 HD045769-01 as part of a K23 Career Development Award (Dr Kennedy). The sponsor of the study had no role in study design, data collection, data analysis, data interpretation, or in the writing of the report. We thank Traci Neﬀ for her assistance with the immune assays, and Diedre Fleener for her assistance with obtaining IRB approval. This study was presented at the 9th World Congress for Infectious and Im- munological Diseases in Obstetrics and Gynecology, Urol- ogy, and Dermatology, November 2005, Maceio, Brazil. REFERENCES [1] CDC. Postexposure prophylaxis, isolation, and quarantine to control an import-associated measles outbreak—Iowa. Morbid- ity and Mortality Weekly Report. 2004;53(41):969–971. [2] Watson JC, Hadler SC, Dykewicz CA, Reef S, Phillips L. Measles, mumps, and rubella–vaccine use and strategies for elimination of measles, rubella, and congenital rubella syndrome and con- trol of mumps: recommendations of the Advisory Commit- tee on Immunization Practices (ACIP). Morbidity and Mortal- ity Weekly Report. Recommendations and Reports. 1998;47(RR- 8):1–57. [3] CDC. Preventable measles among U.S. residents, 2001-2004. Morbidity and Mortality Weekly Report. 2005;54(33):817–820. [4] Haas DM, Flowers CA, Congdon CL. Rubella, rubeola, and mumps in pregnant women: susceptibilities and strategies for testing and vaccinating. Obstetrics and Gynecology. 2005;106(2): 295–300. [5] Crawford GE, Gremillion DH. Epidemic measles and rubella in air force recruits: impact of immunization. Journal of Infectious Diseases. 1981;144(5):403–410. [6] Kelley PW, Petruccelli BP, Stehr-Green P, Erickson RL, Mason CJ. The susceptibility of young adult Americans to vaccine- preventable infections: a national serosurvey of US Army re- cruits. Journal of the American Medical Association. 1991;266 (19):2724–2729. [7] Libman MD, Behr MA, Martel N, Ward BJ. Rubella susceptibil- ity predicts measles susceptibility: implications for postpartum immunization. Clinical Infectious Diseases. 2000;31(6):1501– 1503. [8] Sauvera JL, Jacobson RM, Vierkant RA, et al. Correlations between measles, mumps, and rubella serum antibody levels in Olmsted County school children. Vaccine. 2001;19(11-12): 1363–1368. 3