Texas. Department of State Health Services. Immunization Branch. Influenza (The Flu) Fact sheet for Child-Care Settings, pamphlet, July 2010; (https://texashistory.unt.edu/ark:/67531/metapth903236/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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