1. World Health Organization (2020a). Coronavirus disease 2019 (COVID-19). Situation Report 24 WHO.
2. Ministère de la santé du Cameroun (2020), Rapport de la situation COVID-19
3. Jones, J. H. (2007). Notes on R0. Califonia: Department of Anthropological Sciences.
4. Contributions to the mathematical theory of epidemics, part i. Proceedings of the Royal Society of Edinburgh;W. O. Kermack;Section A. Mathematics,1927
5. Why is it difficult to accurately predict the COVID-19 epidemic?;W. C. Roda;Infectious Disease Modelling,2020