Short CommunicationMumps resurgence in Denmark
Section snippets
Background
The past decade has witnessed a resurgence of mumps in several countries where seemingly good mumps control had been achieved through vaccination [1]. By 2010, 118 countries had introduced mumps vaccine, usually in two-dose schedules with measles–mumps–rubella (MMR) vaccine [2]. The year of introduction of one- and two-dose schedules and age groups targeted by immunization and catch-up programs have varied substantially between countries, and each country presents its own epidemiological
Study design
Retrospective cohort study using national laboratory and epidemiology data.
All laboratory confirmed mumps cases available at the central national laboratory at Statens Serum Institut (SSI), Section for Virus Surveillance and Research (parotitisvirus detection by PCR in either throat swap, serum or urine samples) were linked to the national parotitis epidemiology database using the unique social security number. This enabled us to investigate the epidemiological profile and immunization status
Mumps epidemiology in Denmark 1994–2013
Mumps has been individually notifiable since 1994, and 390 cases were reported from 1994 to 2013; the yearly number and incidence are shown in Fig. 1. The lowest incidence was observed in 2002 at 0.4 per 100,000 (95% CI: 0.4–1.1) while in 2013, the incidence had increased to 0.96 per 100,000 (95% CI: 0.8–1.2). Males constitute 59% of cases for the whole period and 56% in 2013 (Table 1). Following an initial decline, mumps case numbers have increased; in 2013 we recorded the highest number in
Discussion
In spite of the insufficient vaccine uptake, the vaccine did initially appear to control the infection: by 2001–2003 only a few cases of mumps were reported per year, with almost half acquired abroad. Since then, however, the yearly number of cases has increased and most are acquired in Denmark.
The age distribution has changed markedly over time, and in recent years young adults have represented the main burden of disease in Denmark, as has been the case elsewhere [1], [6], [7], [8]. Of note is
Funding
None.
Competing interests
None.
Ethical approval
Not needed.
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