The long reach of bugs without borders.
Possehl
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D002487:Centers for Disease Control and Prevention, U.S.; D003140:Communicable Disease Control / Q000639:trends*; D003141:Communicable Diseases / Q000175:diagnosis / Q000453:epidemiology / Q000635:transmission; D004196:Disease Outbreaks / Q000517:prevention & control*; D014943:Global Health; D006801:Humans; D007251:Influenza, Human / Q000517:prevention & control; D011634:Public Health / Q000639:trends*; D012307:Risk Factors; D014195:Travel; D014481:United States / Q000453:epidemiology