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George Beyan, an Ebola survivor, cares for his son in Liberia.Credit Daniel Berehulak for The New York Times

Ask Well: Immune to Ebola?

If a person is infected with Ebola and recovers, are they then immune to the disease or can they still contract it again?Read more…

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From left, Jane M. Carlton, a New York University geneticist, with her students Julia Maritz and Susan Joseph. Dr. Carlton hopes to uncover trends in infectious diseases through wastewater.Credit Joshua A. Krisch

What Our Sewage Can Teach Us

By analyzing samples from each of the five New York City boroughs, Jane M. Carlton hopes to detect viruses before an outbreak.Read more…