Mohamed Ali Ag Ahmed, Yibeltal Assefa, Steve Ahuka-Mundeke, Placide Mbala, Jean-Jacques Muyembe-Tamfum, N S Prashanth, Sameh Al-Awlaqi, Andreas Kalk, Peter Aaby, Helmut Kloos, Kéfilath Bello, Vincent De Brouwere, Kristien Verdonck, Joël Arthur Kiendrébéogo, Wim Van Damme, Ian Van Engelgem, Gerald Bloom, Devadasan Narayanan, Stefaan Van der Borght, Seye Abimbola, Por Ir, Jean-Paul Dossou, Remco van de Pas, Guido Vanham, Edwin Wouters, Brecht Ingelbeen, Alexandre Delamou, Ritwik Dahake
Journal: BMJ global health 2020;5(7):e003098
PMID: 32718950
It is very exceptional that a new disease becomes a true pandemic. Since its emergence in Wuhan, China, in late 2019, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes COVID-19, has spread to nearly all countries of the world in only a few months. However, in different countries, the COVID-19 epidemic takes variable shapes and forms in how it affects communities. Until now, the insights gained on COVID-19 have been largely dominated by the COVID-19 epidemics and the lockdowns in China, Europe and the USA. But this variety of global trajectories is little described, analysed or understood. In only a few months, an enormous amount of scientific evidence on SARS-CoV-2 and COVID-19 has been uncovered (knowns). But important knowledge gaps remain (unknowns). Learning from the variety of ways the COVID-19 epidemic is unfolding across the globe can potentially contribute to solving the COVID-19 puzzle. This paper tries to make sense of this variability-by exploring the important role that context plays in these different COVID-19 epidemics; by comparing COVID-19 epidemics with other respiratory diseases, including other coronaviruses that circulate continuously; and by highlighting the critical unknowns and uncertainties that remain. These unknowns and uncertainties require a deeper understanding of the variable trajectories of COVID-19. Unravelling them will be important for discerning potential future scenarios, such as the first wave in virgin territories still untouched by COVID-19 and for future waves elsewhere.
© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.
© Copyright 2026, Nutrition Evidence
We use cookies to improve your experience and analyze site traffic with Google Analytics. By continuing to use our site, you agree to our use of cookies. Learn more.