The Spanish Flu, also known as the H1N1 influenza pandemic, was the most deadly pandemic in modern history, infecting around one-third of the global population and killing an estimated 50 million people.
This H2N2 influenza pandemic originated in East Asia and is estimated to have killed 1-2 million people worldwide.
The H3N2 influenza pandemic, often known as the Hong Kong Flu, killed an estimated one million people worldwide.
Despite the fact that it is not an influenza virus, HIV/AIDS has had a tremendous worldwide impact, resulting in nearly 40 million deaths since the pandemic began.
While the SARS outbreak was relatively short-lived, it had a high fatality rate of roughly 10%, with around 800 deaths documented.
This influenza pandemic was caused by a new H1N1 virus and killed between 151,000 and 575,000 people globally.
Middle East respiratory syndrome (MERS) is caused by a coronavirus and has a 35% fatality rate. While its reach has been restricted, around 850 deaths have been documented.
Over 11,000 people died as a result of the Ebola virus outbreak, with the bulk of cases happening in Guinea, Liberia, and Sierra Leone.
While the Zika virus usually produces mild symptoms, it can cause serious birth defects in babies born to infected women, prompting the World Health Organisation to declare it a public health emergency.
The COVID-19 pandemic, caused by the SARS-CoV-2 virus, has had a large worldwide impact, with nearly 7 million deaths documented.