How the Ebola outbreak spread.

The epidemics of the early 21st century revealed a world unprepared, even as the risks continue to multiply. Much worse is coming.

Sheikh Humarr Khan was a globally renowned expert in tropical diseases, and the hero who ran Sierra Leone’s worst Ebola ward. So why, when he finally fell ill, was he denied the extraordinary treatments that could have saved him?

During the financial crisis, Sal Pane ran a multimillion-dollar mortgage scam. A few years later, with the help of some high-profile media appearances and a dead man's resume, he won the government contract to clean up Ebola in New York.

The author of The Hot Zone on how geneticists can help contain the current outbreak.

When animals infect us.

A profile of a doctor fighting Ebola in Uganda.