Although there is not universal consensus regarding where the virus originated, it spread worldwide during 1918-1919. In the United States, it was first identified in military personnel in spring 1918. It is estimated that about 500 million people or one-third of the world's population became infected with this virus.
By death toll
| Rank | Epidemics/pandemics | Date |
|---|
| 1 | Black Death | 1346–1353 |
| 2 | Spanish flu | 1918–1920 |
| 3 | Plague of Justinian | 541–549 |
| 4 | HIV/AIDS global epidemic | 1981–present |
The longest-enduring pandemic disease outbreak is the Seventh Cholera Pandemic, which originated in Indonesia and began to spread widely in 1961. As of 2020, some 59 years later, this pandemic is still ongoing and infects an estimated 3-5 million people annually.
Wild waterfowl captured between 1915 and 1919 were tested for influenza A virus RNA. One bird, captured in 1917, was infected with a virus of the same hemagglutinin (HA) subtype as that of the 1918 pandemic virus.
The Spanish flu pandemic lasted from 1918 to 1920. Older estimates say it killed 40–50 million people while current estimates say 50 million to 100 million people worldwide were killed.
Riley, Kansas in March of 1918 after gale force winds kicked up while soldiers were burning tons of manure. It created a massive yellow dust haze that burned throats and sinuses. Two days later there were 100 cases of flu at the camp hospital, and a week later, 500.
The lethal influenza pandemic that struck New Zealand between October and December 1918 killed about 9000 people in two months.
Both contemporary epidemiological studies and lay histories of the pandemic have identified the first known outbreak of epidemic influenza as occurring at Camp Funston, now Ft. Riley, in Kansas.
In 1918 the United States was involved in World War I, but was also dealing with the outbreak of a deadly influenza epidemic. The first cases of the outbreak were recorded in Haskell County, Kansas, and Fort Riley, Kansas, where young men were being hospitalized for severe flu-like symptoms.
A combination of public health efforts to contain and mitigate the pandemic – from rigorous testing and contact tracing to social distancing and wearing masks – have been proven to help. Given that the virus has spread almost everywhere in the world, though, such measures alone can't bring the pandemic to an end.
The 1957–1958 Asian flu pandemic was a global pandemic of influenza A virus subtype H2N2 that originated in Guizhou in southern China. The number of deaths caused by the 1957–1958 pandemic is estimated between one and four million worldwide, making it one of the deadliest pandemics in history.
COVID-19 Is Officially the Worst Pandemic in US History, Surpassing the Death Toll From the 1918 Spanish Flu. Let's put this alarming milestone in perspective. For more than a century, the deadly 1918 flu has been the benchmark for pandemics in the US.
The most popular theory of how the plague ended is through the implementation of quarantines. The uninfected would typically remain in their homes and only leave when it was necessary, while those who could afford to do so would leave the more densely populated areas and live in greater isolation.
At-risk countries.Estimates of their overall immunity remain low enough that there is still a risk of significant waves of disease. Recent projections suggest that it is likely to take until late 2022 or early 2023 for these countries to achieve high vaccine coverage.
One of the worst plagues in history arrived at Europe's shores in 1347. Five years later, some 25 to 50 million people were dead. Nearly 700 years after the Black Death swept through Europe, it still haunts the world as the worst-case scenario for an epidemic.
In February 1957, a new influenza A (H2N2) virus emerged in East Asia, triggering a pandemic (“Asian Fluâ€). This H2N2 virus was comprised of three different genes from an H2N2 virus that originated from an avian influenza A virus, including the H2 hemagglutinin and the N2 neuraminidase genes.
Unpacking The “Spanish Flu†Mortality NumbersThe 675,000 deaths attributed to the influenza epidemic made up 0.64 percent of the total population, a little more than six in every thousand people.
