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April 17, 2014

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Thomas Clark, chief of the meningitis branch of the U.S. Centers for Disease Control and Prevention, walks to the campus center at Princeton University in Princeton, N.J., Monday, Dec. 9, 2013. Clark was at the center to oversee as the Ivy League school began vaccinating nearly 6,000 students to try to stop an outbreak of type B meningitis.

AP Photo/Mel Evans

Thomas Clark, chief of the meningitis branch of the U.S. Centers for Disease Control and Prevention, walks to the campus center at Princeton University in Princeton, N.J., Monday, Dec. 9, 2013. Clark was at the center to oversee as the Ivy League school began vaccinating nearly 6,000 students to try to stop an outbreak of type B meningitis.