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Claire McCall, right, works with student family nurse practioner Ling... News PhotoDallas,Family,Gulf Coast States,Healthcare And Medicine,Horizontal,Nurse,Student,Texas,USA,WorkingPhotographer Collection: Tribune News Service 2012 MCTClaire McCall, right, works with student family nurse practioner Ling Sanchez at the Agape Clinic in Dallas, Texas, on August 21, 2012. McCall suffers from West Nile virus symptoms four years after first contracting the virus. (Joyce Marshall/Fort Worth Star-Telegram/MCT via Getty Images)