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

Author:

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

Abstract

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.

Publisher

Cambridge University Press (CUP)

Subject

Infectious Diseases,Epidemiology

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5. Large outbreak of mumps virus genotype G among vaccinated students in Norway, 2015 to 2016

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