Six students and a visitor have fallen ill with meningitis at Princeton University in New Jersey, shown here in August 2013. All have recovered or are recovering, officials said. Bloomberg via Getty Images hide caption

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Spinal MRIs similar to these found infections that many patients hadn't realized they had. Stefano Raffini/ hide caption

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New England Compounding Center co-owner Barry Cadden went to Capitol Hill for a congressional hearing Wednesday on the fungal meningitis outbreak. Choosing to take the Fifth Amendment, Cadden did not testify. Susan Walsh/AP hide caption

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A Framingham police officer keeps watch as federal agents search the New England Compounding Center company in Framingham, Mass., on October 16. Dominick Reuter/Reuters /Landov hide caption

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Matthew Spencer receives intravenous infusions of a potent antifungal drug at home twice a day for an indefinite period to treat a suspected case of fungal infection linked to a contaminated steroid drug that came from New England Compounding Center in Massachusetts. Richard Knox/NPR hide caption

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Federal agents investigate the offices of the New England Compounding Center in Framingham, Mass., on Tuesday. The company's steroid medication has been linked to a deadly meningitis outbreak. Barry Chin/AP hide caption

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