1723. Mumps Attack Rates Following Administration of a Third Dose of MMR Vaccine to School-Aged Children, Arkansas, 2016–2017
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1723. Mumps Attack Rates Following Administration of a Third Dose of MMR Vaccine to School-Aged Children, Arkansas, 2016–2017

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  • English
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    Details:

    • Alternative Title:
      Open Forum Infect Dis
    • Personal Author:
    • Conference Authors:
      IDWeek (2018 October 3-7 : San Franciso, CA)
    • Description:
      Background

      During the 2016–2017 school year, the largest mumps outbreak in the United States since 2006 occurred in Arkansas with nearly 3,000 cases. As part of outbreak response, a third dose of measles–mumps–rubella vaccine (MMR3) was offered at 27 schools with mumps attack rates ≥5 cases/1,000 students. We compared attack rates after vaccination clinics among students who received MMR3 and students with 2 MMR vaccine doses.

      Methods

      We obtained information on school enrollment and student immunization status from school registries, and mumps case status from Arkansas’s National Electronic Disease Surveillance System database. We included students aged 6–21 years who had previously received ≥2 doses of MMR vaccine. We used Arkansas’s Immunization Information System to identify students who received MMR3.

      Results

      A total of 18 schools (10 elementary, 8 middle/junior high) with 10,275 students who had previously received ≥2 doses of MMR (85% of total enrolled) met inclusion criteria. Median number of students per school was 553. Median student age was 11 years (range, 6–18) and 1,525 students received MMR3. MMR3 uptake varied by school (median, 12%; range, 2–33%; interquartile range, 7–22%). A total of 12 mumps cases occurred among MMR3 recipients and 122 cases among 2-dose recipients. School-specific attack rates ranged from 0 to 23 cases/1,000 students among 3-dose recipients, and 2–41 cases/1,000 students among 2-dose recipients. Mumps attack rates within each school were lower for 3-dose recipients vs. 2-dose recipients in all but one school (P < .05). The differences in attack rates between 2- and 2-dose recipients ranged from −5 to 23 cases/1,000 students (median, 5/1,000).

      Conclusion

      Mumps attack rates were lower in 3-dose vs. 2-dose MMR vaccine recipients after MMR3 vaccination clinics, supporting a benefit of MMR3 for persons in outbreak settings. Further analysis is needed to determine impact of MMR3 on duration and size of mumps outbreaks.

      Disclosures

      All authors: No reported disclosures.

    • Subjects:
    • Source:
      Open Forum Infect Dis. 2018; 5(Suppl 1):S54.
    • Pubmed Central ID:
      PMC6252430
    • Document Type:
      Journal Article
    • Genre:
    • Place as Subject:
      Arkansas
    • Collection(s):
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