The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is the virus responsible for the coronavirus disease 2019 (COVID-19), was originally detected in Wuhan, China in December 2019. SARS-CoV-2 is a rapidly evolving virus with a mutation rate that is about 9.8 x 10-4 substitutions per site per year, along with a high rate of lineage turnover.

Study: Analysis of SARS-CoV-2 variants from 24,181 patients exemplifies the role of globalisation and zoonosis in pandemics. Image Credit: solarseven / Shutterstock.com

The different national curves of COVID-19 cases

Different epidemic patterns brought about by SARS-CoV-2 have been observed in different countries around the world. A bell-shaped curve, which is typical of a seasonal viral respiratory infection, was observed in Asia. Comparatively, the bell-shaped curve recorded in Western countries experienced one or two peaks.

In Marseille, France, a…

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