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 ... more 
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. The vaccinations were recommended by the CDC. The vaccine is being made available to all undergraduates, as well as graduate students who live in dorms and employees with certain medical conditions. Seven students and one prospective student who was visiting campus have been stricken by potentially life-threatening type B meningococcal disease since March. None of the cases has been fatal. (AP Photo/Mel Evans) less 
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Associated Press | Photo By Mel Evans
Mon, Dec 9, 2013 6:20 PM EST