Princeton University officials say more than 90 percent of the eligible students and staff received a meningitis vaccine this week as part of the university's effort to halt an outbreak.
Nearly 5,300 people chose to get the vaccine for the B strain of the meningitis bacteria. The vaccine is approved for use in Europe, Australia and Canada but is not yet approved for general use in the United States.
The U.S. Centers for Disease Control and Prevention recommended the unusual step and the Food and Drug Administration approved it.
The shots were available for all undergraduates along with some graduate students and employees Monday through Thursday.
Those who received the vaccine are recommended to get booster doses in February.
Explore further: Princeton U. to give students meningitis B vaccine (Update 2)