What animal did the Spanish flu come from?
The 1918 influenza pandemic caused an estimated 50 million to 100 million deaths worldwide.
The virus that caused the 1918 influenza pandemic probably sprang from North American domestic and wild birds, not from the mixing of human and swine viruses..
What age group was affected the most by the 1918 flu?
Read about the 1918 influenza pandemic and progress made in preparedness and response. Mortality was high in people younger than 5 years old, 20-40 years old, and 65 years and older. The high mortality in healthy people, including those in the 20-40 year age group, was a unique feature of this pandemic.
What was the mortality rate of the 1918 flu?
An estimated one third of the world’s population (or ≈500 million persons) were infected and had clinically apparent illnesses (1,2) during the 1918–1919 influenza pandemic. The disease was exceptionally severe. Case-fatality rates were >2.5%, compared to <0.1% in other influenza pandemics (3,4).
How long did the 1918 flu epidemic last in America?
Wherever it began, the pandemic lasted just 15 months but was the deadliest disease outbreak in human history, killing between 50 million and 100 million people worldwide, according to the most widely cited analysis.
What age group did the Spanish flu affect?
The Spanish Influenza affected particularly the 25- to 34-year-old and 15- to 24-year-old age groups.
What made the 1918 flu so deadly?
Scientists offer several possible explanations for the high mortality rate of the 1918 influenza pandemic. Some analyses have shown the virus to be particularly deadly because it triggers a cytokine storm, which ravages the stronger immune system of young adults.