Nancy Writebol, an aid worker in Liberia, was helping treat Ebola patients until she tested positive for the virus herself - the second American so far.
This comes just days after another American, Dr. Kent Brantly also became infected while treating Ebola patients.
The current outbreak is the deadliest ever, so far claiming hundreds of lives.
And many more people could be infected and not even know it yet. One man boarded a flight last week not knowing he had Ebola. But days later, he died. His flight included stops in three countries.
CNN's Erin Burnett speaks with Ken Isaacs, Vice President of Samaritan's Purse, an organization the two Americans are affiliated with - about their current condition.
There are new revelations about the minutes before Malaysia Airlines Flight 17 crashed. A Ukrainian official says the black boxes show the jet suffered "massive explosive decompression" after it was hit by shrapnel from a surface-to-air missile.
The downing of Flight 17 is the second deadly incident in just four months, and now, Malaysia Airlines is trying to overhaul its brand and is considering a name change..
But long before MH17 was shot out of the sky and MH370 vanished, the airline had a history of scandal.
CNN's Ana Cabrera is OutFront.
Last week, the parents of a Malaysia Airlines Flight 17 passenger told CNN's Erin Burnett they refused to believe their daughter died in the crash.
Now, they're risking their lives in the process, becoming the first family members of a victim to make it to the crash site.
Kyung Lah has the story.
The fighting between Israel and Hamas is raging on with explosions and intense new fighting in Gaza City.
Gaza says children among dead after refugee camp struck
Israel's Prime Minister Benjamin Netanyahu is preparing for the long-haul telling his citizens to be prepared for a "protracted campaign in Gaza."
Israel says five of its soldiers were killed today, while officials in Gaza say 10 Palestinians, eight of them children, were killed by an explosion at a refugee camp.
Karl Penhaul is in Gaza City with the latest.