Refugees, immigrants, and the public health.
D004641:Emigration and Immigration / Q000266:history*; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011634:Public Health / Q000266:history*; D012036:Refugees; D012952:Societies; D014481:United States; D014492:United States Public Health Service