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“Now that you have a cluster of 14 health care workers infected, the potential for spread is greater,” said Dr. Ian W. Lipkin, director of the Center for Infection and Immunity at Columbia University.

"There is a growing understanding of the need to design our environments in a way that designs out loneliness," said Dr. Linda Fried, dean of Columbia University's Mailman School of Public Health.

W. Ian Lipkin, a Columbia University professor who worked to fight the SARS outbreak, said it was too early to know how dangerous the new virus might prove to be.