Mumps outbreak among fully vaccinated school-Age children and young adults, Portugal 2019/2020

Mariana Perez Duque*, Ana San-Bento, Lourdes Léon, Paula Custódio, Maria Anjos Esperança, Maria João Albuquerque, Marina Nascimento, Sooria Balasegaram, Rita Sá Machado

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

On 16-17 January 2020, four suspected mumps cases were reported to the local Public Health Authorities with an epidemiological link to a local school and football club. Of 18 suspected cases identified, 14 were included in this study. Laboratory results confirmed mumps virus as the cause and further sequencing identified genotype G. Our findings highlight that even with a high MMR vaccine coverage, mumps outbreaks in children and young adults can occur. Since most of the cases had documented immunity for mumps, we hypothesise that waning immunity or discordant mumps virus strains are likely explanations for this outbreak.

Original languageEnglish
Article numbere205
JournalEpidemiology and Infection
Volume149
DOIs
Publication statusPublished - 27 Aug 2021

Bibliographical note

Publisher Copyright:
Copyright © The Author(s), 2021. Published by Cambridge University Press.

Keywords

  • Key words MMR vaccination
  • Mumps
  • Outbreaks
  • Vaccine preventable diseases
  • Virology

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