Increased outbreaks of monkeypox highlight gaps in actual disease burden in Sub-Saharan Africa and in animal reservoirs

• Published in: International journal of infectious diseases Vol. 122; pp. 107 - 111
• Main Authors: Haider, Najmul, Guitian, Javier, Simons, David, Asogun, Danny, Ansumana, Rashid, Honeyborne, Isobella, Velavan, Thirumalaisamy P, Ntoumi, Francine, Valdoleiros, Sofia R., Petersen, Eskild, Kock, Richard, Zumla, Alimuddin
• Format: Journal Article
• Language: English
• Published: Canada Elsevier Ltd 01-09-2022; Elsevier
• Subjects: Africa, Central; Animals; Cost of Illness; Disease Outbreaks; Humans; Monkeypox virus; Mpox (monkeypox) - epidemiology; Mpox (monkeypox) - prevention & control; MPX; Nigeria; outbreaks; Reservoirs; Rodentia; smallpox vaccine; West Africa; Africa, Central; Monkeypox virus; MPX; West Africa; Reservoirs; outbreaks; Nigeria; smallpox vaccine
• ISSN: 1201-9712; 1878-3511
• DOI: 10.1016/j.ijid.2022.05.058

•We present explanation for the 2022 monkeypox epidemic in the Western world•The true burden of MPX and the extent of animal reservoirs are not well known•The increased rodent-human interaction led to increased transmission of MPXV•The population has crossed a threshold for sustainable human-human transmission•A new estimation of basic and effective reproduction rate (R0 and Re) is required
We explain research gaps on Monkeypox (MPX) virus epidemiology in endemic countries and present hypotheses for the recent increase of MPX cases in West Africa as a possible explanation for the current epidemic in Europe, America, and Australia. The detection of >400 MPX cases in less than a month in May 2022, across many countries underscores the epidemic potential of MPX in humans and demonstrates several important research gaps. First, the true burden of MPX in West and Central Africa is poorly understood, although it is critical for prevention and control of future outbreaks. Second, the diversity and extent of the animal reservoir remain unknown. We hypothesize that the synanthropic rodent population has increased in recent years in Africa leading to more human-rodent interactions and thus increased transmission of MPXV. We further hypothesise that nearly 45 years after the end of routine smallpox vaccination, the larger and more interconnected immune-naïve population has crossed a threshold resulting in more sustainable human-to-human transmission of MPXV. The current epidemic in the Western World is possibly a consequence of increased local transmission of MPXV in Africa. A new estimation of the basic and effective reproduction rate (R0 and Re) in different populations is required. National, regional, and international collaborations are needed to address research gaps related to MPX outbreaks.