Gradual emergence followed by exponential spread of the SARS-CoV-2 Omicron variant in Africa

Author:

Fischer Carlo1ORCID,Maponga Tongai Gibson2ORCID,Yadouleton Anges3ORCID,Abílio Nuro4,Aboce Emmanuel5ORCID,Adewumi Praise3,Afonso Pedro6,Akorli Jewelna7ORCID,Andriamandimby Soa Fy8ORCID,Anga Latifa9,Ashong Yvonne7,Beloufa Mohamed Amine10,Bensalem Aicha10,Birtles Richard1112,Boumba Anicet Luc Magloire1314,Bwanga Freddie515,Chaponda Mike16ORCID,Chibukira Paradzai17,Chico R. Matthew18ORCID,Chileshe Justin16ORCID,Chongwe Gershom16ORCID,Cissé Assana19,D’Alessandro Umberto20ORCID,de Lamballerie Xavier Nicolas21ORCID,de Morais Joana F. M.6ORCID,Derrar Fawzi10ORCID,Dia Ndongo22,Diarra Youssouf23ORCID,Doumbia Lassina23,Drosten Christian124ORCID,Dussart Philippe8ORCID,Echodu Richard11ORCID,Eggers Yannik2526,Eloualid Abdelmajid9,Faye Ousmane22ORCID,Feldt Torsten2526,Frühauf Anna1,Halatoko Afiwa27,Ilouga Pauliana-Vanessa28ORCID,Ismael Nalia4,Jambou Ronan29,Jarju Sheikh20ORCID,Kamprad Antje1ORCID,Katowa Ben3031,Kayiwa John32,King’wara Leonard33ORCID,Koita Ousmane23,Lacoste Vincent8ORCID,Lagare Adamou29,Landt Olfert34ORCID,Lekana-Douki Sonia Etenna35ORCID,Lekana-Douki Jean-Bernard35ORCID,Iipumbu Etuhole36,Loemba Hugues1437ORCID,Lutwama Julius32ORCID,Mamadou Santou29,Maman Issaka27ORCID,Manyisa Brendon17,Martinez Pedro A.6,Matoba Japhet3031ORCID,Mhuulu Lusia36,Moreira-Soto Andres1,Mwangi Judy1112ORCID,N´dilimabaka Nadine35,Nassuna Charity Angella32,Ndiath Mamadou Ousmane20ORCID,Nepolo Emmanuel36,Njouom Richard28,Nourlil Jalal9ORCID,Nyanjom Steven Ger38,Odari Eddy Okoth38ORCID,Okeng Alfred5,Ouoba Jean Bienvenue19,Owusu Michael39ORCID,Owusu Donkor Irene7ORCID,Phadu Karabo Kristen2,Phillips Richard Odame39ORCID,Preiser Wolfgang240ORCID,Ruhanya Vurayai17,Salah Fortune27,Salifou Sourakatou41,Sall Amadou Alpha22,Sylverken Augustina Angelina3942ORCID,Tagnouokam-Ngoupo Paul Alain28ORCID,Tarnagda Zekiba19ORCID,Tchikaya Francis Olivier14,Tufa Tafese Beyene2526ORCID,Drexler Jan Felix124ORCID

Affiliation:

1. Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Institute of Virology, Berlin, Germany.

2. Division of Medical Virology, Stellenbosch University Faculty of Medicine and Health Sciences, Cape Town, South Africa.

3. Laboratoire dés fievres hemorragiques virales de Cotonou, Akpakpa, Benin.

4. Instituto Nacional de Saúde, Maputo, Mozambique.

5. MBN Clinical Laboratories, Kampala, Uganda.

6. Instituto Nacional de Investigação em Saúde (INIS), Luanda, Angola.

7. Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Ghana.

8. Institut Pasteur de Madagascar, Antananarivo, Madagascar.

9. Institut Pasteur du Maroc, Casablanca, Morocco.

10. Institut Pasteur of Algeria, National Influenza Centre, Sidi-Fredj, Algeria.

11. Gulu University Multifunctional Research Laboratories, Gulu, Uganda.

12. School of Science, Engineering and Environment, University of Salford, Salford, UK.

13. Faculty of Health Sciences, Marien Ngouabi University, Pointe-Noire, Congo.

14. Molecular Diagnostic Laboratory HDL, Pointe-Noire, Congo.

15. Makerere University College of Health Sciences, Kampala, Uganda.

16. Tropical Diseases Research Centre, Ndola Teaching Hospital, Ndola, Zambia.

17. National Virology Laboratory, Faculty of Medicine and Health Sciences, University of Zimbabwe, Avondale, Zimbabwe.

18. London School of Hygiene and Tropical Medicine, London, UK.

19. Laboratoire National de Référence-Grippes, Ouagadougou, Burkina Faso.

20. Medical Research Council Unit at London School of Hygiene and Tropical Medicine, Banjul, Gambia.

21. Unité des Virus Émergents, Aix Marseille Université, Marseille, France.

22. Institut Pasteur de Dakar (IPD), Dakar, Senegal.

23. Université des Sciences, des Techniques et des Technologies de Bamako (USTTB), Bamako, Mali.

24. German Centre for Infection Research (DZIF), associated Partner Charité-Universitätsmedizin Berlin, Berlin, Germany.

25. Hirsch Institute of Tropical Medicine, Asella, Ethiopia.

26. Department of Gastroenterology, Hepatology and Infectious Diseases, University Hospital Düsseldorf, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.

27. Institut National d’Hygiène, Lomé, Togo.

28. Centre Pasteur du Cameroun, Yaounde, Cameroon.

29. Centre de Recherche Médicale et Sanitaire (CERMES), Niamey, Niger.

30. Macha Research Trust, Choma, Zambia.

31. School of Veterinary Medicine, University of Zambia, Lusaka, Zambia.

32. Uganda Virus Research Institute, Entebbe, Uganda.

33. National Public Health Reference Laboratory, Ministry of Health, Nairobi, Kenya.

34. TiB-Molbiol GmbH, Berlin, Germany.

35. Centre Interdisciplinaire de Recherches Médicales de Franceville (CIRMF), Franceville, Gabon.

36. School of Medicine, University of Namibia, Windhoek, Namibia.

37. Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada.

38. School of Biomedical Sciences, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya.

39. Kumasi Centre for Collaborative Research in Tropical Medicine (KCCR), Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana.

40. National Health Laboratory Service Tygerberg Business Unit, Cape Town, South Africa.

41. Ministère de la Santé, Akpakpa, Benin.

42. Department of Theoretical and Applied Biology, KNUST, Kumasi, Ghana.

Abstract

The geographic and evolutionary origins of the SARS-CoV-2 Omicron variant (BA.1), which was first detected mid-November 2021 in Southern Africa, remain unknown. We tested 13,097 COVID-19 patients sampled between mid-2021 to early 2022 from 22 African countries for BA.1 by real-time RT-PCR. By November-December 2021, BA.1 had replaced the Delta variant in all African sub-regions following a South-North gradient, with a peak Rt of 4.1. Polymerase chain reaction and near-full genome sequencing data revealed genetically diverse Omicron ancestors already existed across Africa by August 2021. Mutations, altering viral tropism, replication and immune escape, gradually accumulated in the spike gene. Omicron ancestors were therefore present in several African countries months before Omicron dominated transmission. These data also indicate that travel bans are ineffective in the face of undetected and widespread infection.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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