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In this Jan. 14, 2014, photo, Daniel Bennett, 26, of College Park, Md., has live flu virus sprayed into his nose as part of a study at the National Institutes of Health in Bethesda, Md. Government researchers are deliberately giving dozens of volunteers the flu by squirting the virus straight up their noses. The rare type of experiment is part of the quest to improve flu vaccines. It turns out that how best to fend off influenza remains something of a mystery. (AP Photo/Charles Dharapak)

Want to get the flu? Volunteers sneeze for science

By LAURAN NEERGAARD - Associated Press

In this Jan. 14, 2014, photo, Daniel Bennett, 26, of College Park, Md., has live flu virus sprayed into his nose as part of a study at the National Institutes of Health in Bethesda, Md. Government researchers are deliberately giving dozens of volunteers the flu by squirting the virus straight up their noses. The rare type of experiment is part of the quest to improve flu vaccines. It turns out that how best to fend off influenza remains something of a mystery. (AP Photo/Charles Dharapak)

Want to get the flu? Volunteers sneeze for science

By LAURAN NEERGAARD - Associated Press