Spanish flu timeline2/13/2023 ![]() Immunity to this strain was rare in people less than 65 years of age, and a pandemic was predicted. In February 1957, the Asian influenza pandemic was first identified in the Far East. The severity of that virus has not been seen again. The attack rate and mortality was highest among adults 20 to 50 years old. ![]() With the Spanish flu, mortality rates were high among healthy adults as well as the usual high-risk groups. One of the most unusual aspects of the Spanish flu was its ability to kill young adults. Those who did not succumb to the disease within the first few days often died of complications from the flu (such as pneumonia) caused by bacteria. Some people who felt well in the morning became sick by noon, and were dead by nightfall. Between September 1918 and April 1919, approximately 675,000 deaths from the flu occurred in the U.S. It is estimated that approximately 20 to 40 percent of the worldwide population became ill and that over 50 million people died. The Spanish Influenza pandemic is the catastrophe against which all modern pandemics are measured. Since 1900, three pandemics and several “pandemic threats” have occurred. ![]() History suggests that influenza pandemics have probably happened during at least the last four centuries. ![]() Pandemics and Pandemic Threats since 1900 ![]()
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