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Abstract

Background

Following the 2022–2023 mpox outbreak, crucial knowledge gaps exist regarding orthopoxvirus-specific immunity in risk groups and its impact on future outbreaks.

Aim

We combined cross-sectional seroprevalence studies in two cities in the Netherlands with mathematical modelling to evaluate scenarios of future mpox outbreaks among men who have sex with men (MSM).

Methods

Serum samples were obtained from 1,065 MSM attending Centres for Sexual Health (CSH) in Rotterdam or Amsterdam following the peak of the Dutch mpox outbreak and the introduction of vaccination. For MSM visiting the Rotterdam CSH, sera were linked to epidemiological and vaccination data. An in-house developed ELISA was used to detect vaccinia virus (VACV)-specific IgG. These observations were combined with published data on serial interval and vaccine effectiveness to inform a stochastic transmission model that estimates the risk of future mpox outbreaks.

Results

The seroprevalence of VACV-specific antibodies was 45.4% and 47.1% in Rotterdam and Amsterdam, respectively. Transmission modelling showed that the impact of risk group vaccination on the original outbreak was likely small. However, assuming different scenarios, the number of mpox cases in a future outbreak would be markedly reduced because of vaccination. Simultaneously, the current level of immunity alone may not prevent future outbreaks. Maintaining a short time-to-diagnosis is a key component of any strategy to prevent new outbreaks.

Conclusion

Our findings indicate a reduced likelihood of large future mpox outbreaks among MSM in the Netherlands under current conditions, but emphasise the importance of maintaining population immunity, diagnostic capacities and disease awareness.

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This work is licensed under a Creative Commons Attribution 4.0 International License.
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2024-04-25
2024-11-21
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2024.29.17.2300532
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Scenarios of future mpox outbreaks among men who have sex with men: a modelling study based on cross-sectional seroprevalence data from the Netherlands, 2022
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Marc+C+Shamier&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Shamier Marc C</a>, <a href="/search?value1=Luca+M+Zaeck&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Zaeck Luca M</a>, <a href="/search?value1=Hannelore+M+G%C3%B6tz&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Götz Hannelore M</a>, <a href="/search?value1=Bruno+Vieyra&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Vieyra Bruno</a>, <a href="/search?value1=Babs+E+Verstrepen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Verstrepen Babs E</a>, <a href="/search?value1=Koen+Wijnans&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Wijnans Koen</a>, <a href="/search?value1=Matthijs+RA+Welkers&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Welkers Matthijs RA</a>, <a href="/search?value1=Elske+Hoornenborg&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Hoornenborg Elske</a>, <a href="/search?value1=Brigitte+AGL+van+Cleef&option1=author&noRedirect=true" class="nonDisambigAuthorLink">van Cleef Brigitte AGL</a>, <a href="/search?value1=Martin+E+van+Royen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">van Royen Martin E</a>, <a href="/search?value1=Kai+J+Jonas&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Jonas Kai J</a>, <a href="/search?value1=Marion+PG+Koopmans&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Koopmans Marion PG</a>, <a href="/search?value1=Rory+D+de+Vries&option1=author&noRedirect=true" class="nonDisambigAuthorLink">de Vries Rory D</a>, <a href="/search?value1=David+AMC+van+de+Vijver&option1=author&noRedirect=true" class="nonDisambigAuthorLink">van de Vijver David AMC</a>, <a href="/search?value1=Corine+H+GeurtsvanKessel&option1=author&noRedirect=true" class="nonDisambigAuthorLink">GeurtsvanKessel Corine H</a></span>. Scenarios of future mpox outbreaks among men who have sex with men: a modelling study based on cross-sectional seroprevalence data from the Netherlands, 2022. <a href="/content/ecdc">Euro Surveill.</a> 2024;29(17):pii=2300532. <a href="https://doi.org/10.2807/1560-7917.ES.2024.29.17.2300532" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2024.29.17.2300532</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 01 Sept 2023;&nbsp;&nbsp; <span class="generated">Accepted</span>: 29 Jan 2024 </span> </p>
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