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To understand the virus's re-emergence in America in 2025, some experts are looking to a past epidemic that had a high death rate in Philadelphia.

A small, preliminary study found that marathoners were much more likely to have precancerous growths. Experts aren't sure why.

The administration has pledged to end support for Housing First, the approach behind the V.A.'s greatest housing success story.

Chikungunya, which can disable victims for years, is spreading rapidly, including in China and other places that have not seen it before.