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. 2022 Oct 25;9(11):ofac501.
doi: 10.1093/ofid/ofac501. eCollection 2022 Nov.

Transmission Potential of Human Monkeypox in Mass Gatherings

Vana Sypsa  1 , Ioannis Mameletzis  2 , Sotirios Tsiodras  3
Affiliations

Transmission Potential of Human Monkeypox in Mass Gatherings

Vana Sypsa et al. Open Forum Infect Dis. .

Abstract

Since May 2022, a large number of monkeypox cases have been reported in Europe, the United States, and other nonendemic settings. Taking into account the strict measures implemented due to the coronavirus disease 2019 pandemic and the desire of people to reclaim what is perceived as lost time, mass gatherings this summer were highly attended. Based on data for the secondary attack rate among unvaccinated contacts from endemic countries, we estimate that, on average, >1 secondary case is anticipated per infectious person if he/she has a high number of group contacts (>30) or >8 close contacts. Although the role of group contacts in mass gatherings is uncertain (less likely to involve physical contact, shorter duration), close contacts associated with the event (eg, intimate/sexual contact with other attendees) might be the amplifying event. Enforcing awareness, early recognition, and engaging affected populations in the monkeypox response are important to control transmission.

Keywords: basic reproduction number; mass gathering; monkeypox; secondary attack rate.

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Conflict of interest statement

Potential conflicts of interest. We declare no competing interests related to this work. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed.

Figures

Figure 1.
Figure 1.
Basic reproduction number (R0) estimated under various scenarios for the number of close and other (group) contacts in a mass gathering. Mean and 95% credible intervals were obtained through 5000 simulations with secondary attack rates for unvaccinated contacts obtained from Beer and Rao [22]. A, Heatmap of the mean R0. B, Mean (thick lines) and 95% credible intervals (shaded areas) of R0. The dashed line indicates the threshold of R0 = 1. Subgraphs correspond to the respective number of close contacts.
See this image and copyright information in PMC

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