Registered nurse Sara Hoffman draws a blood sample from freshman student Benjamin Stan, from Fairfax, Va. , Thursday, Sept. 10, 2009, at Duke University in Durham, N.C. AP Photo logo AP Photo 2 months ago

Registered nurse Sara Hoffman draws a blood sample from freshman student Benjamin Stan, from Fairfax, Va. , Thursday, Sept. 10, 2009, at Duke University in Durham, N.C.