Answer:
The first wave was in the spring of 1918. The first outbreak of flu-like illnesses was detected in the U.S. in March, with more than 100 cases reported at Camp Funston in Fort Riley, Kansas. More people died during the 1918 pandemic than the total number of military and civilian deaths that resulted from World War I.
The second wave was in the fall of 1918. In 1918, many health professionals served in the U. S. military during WWI, resulting in shortages of medical personnel around the U.S. The economy suffered as businesses and factories were forced to close due to sickness amongst workers.
The third wave was in the winter of 1918. A third wave of illness occurred during the winter and spring of 1919, adding to the pandemic death toll. The third wave of the pandemic subsided during the summer of 1919.
An estimated 1/3 of the world’s population was infected with the 1918 flu virus – resulting in at least 50 million deaths worldwide.
Source-CDC.gov
