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Smallpox eradication, coordinated by the WHO and certified 40 years ago, led to the cessation of routine smallpox vaccination in most countries. It is estimated that over 70% of the world's population is no longer protected against smallpox, and through cross-immunity, to closely related orthopox viruses such as monkeypox. Monkeypox is now a re-emerging disease. Monkeypox is endemic in as yet unconfirmed animal reservoirs in sub-Saharan Africa, while its human epidemiology appears to be changing. Monkeypox in small animals imported from Ghana as exotic pets was at the origin of an outbreak of human monkeypox in the USA in 2003. Travellers infected in Nigeria were at the origin of monkeypox cases in the UK in 2018 and 2019, Israel in 2018 and Singapore in2019. Together with sporadic reports of human infections with other orthopox viruses, these facts invite speculation that emergent or re-emergent human monkeypox might fill the epidemiological niche vacated by smallpox. An ad-hoc and unofficial group of interested experts met to consider these issues at Chatham House, London in June 2019, in order to review available data and identify monkeypox-related research gaps. Gaps identified by the experts included:The experts further agreed on the need for a better understanding of the genomic evolution and changing epidemiology of orthopox viruses, the usefulness of in-field genomic diagnostics, and the best disease control strategies, including the possibility of vaccination with new generation non-replicating smallpox vaccines and treatment with recently developed antivirals. Copyright © 2020.

Citation

Karl Simpson, David Heymann, Colin S Brown, W John Edmunds, Jesper Elsgaard, Paul Fine, Hubertus Hochrein, Nicole A Hoff, Andrew Green, Chikwe Ihekweazu, Terry C Jones, Swaib Lule, Jane Maclennan, Andrea McCollum, Barbara Mühlemann, Emily Nightingale, Dimie Ogoina, Adesola Ogunleye, Brett Petersen, Jacqueline Powell, Ollie Quantick, Anne W Rimoin, David Ulaeato, Andy Wapling. Human monkeypox - After 40 years, an unintended consequence of smallpox eradication. Vaccine. 2020 Jul 14;38(33):5077-5081

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PMID: 32417140

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