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Image showing four graphs.  Graphs represent age incidence of pneumonia and the percentage of influenza and related diseases that were complicated by pneumonia in Baltimore and Hagerstown, Maryland. Map of the United States.  Different areas are shaded according to the first recorded date of the outbreak in that area.   
c 1918-1944. Age incidence of pneumonia and the percentage of influenza and related diseases that were complicated by pneumonia in Baltimore and Hagerstown, Maryland. The 1918 influenza pandemic occurred too rapidly for the PHS to develop a detailed study of the pandemic. After the pandemic, they developed a map with approximate dates of the outbreak. [Credit: Office of the Public Health Service Historian] When an epidemic emerged, the Public Health Service’s epidemiologists tracked the disease, house by house. The 1918 influenza pandemic occurred too rapidly for the PHS to develop a detailed study of the pandemic. This map was used to trace a smaller typhoid epidemic which erupted in Washington DC in 1906. [Credit: Office of the Public Health Service Historian]
  
 
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