The first was the swine flu pandemic, caused by the H1N1 influenza virus which originated in Mexico in 2009. It is estimated to have affected as many as 1.4 billion people world-wide over a period of some 19 months, causing upwards of 600,000 deaths.
The second was the Covid-19 pandemic, caused by the SARS-CoV-2 virus, which originated in Wuhan in China in December 2019. While the World Health Organisation reports almost 800 million cases and more than 7 million deaths, they believe this grossly under-represents the true situation.

