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.
Bibliographical noteFunding Information: The authors did not receive support from any organisation for the submitted work.
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Publisher Copyright: © The Author(s), 2021. Published by Cambridge University Press
Citation: Duque, Mariana Perez, et al. "Mumps outbreak among fully vaccinated school-age children and young adults, Portugal 2019/2020." Epidemiology & Infection 149 (2021).
- Key words MMR vaccination
- Vaccine preventable diseases