There are no signs the disease is under control in the hardest-hit areas.
The window to tamp down the outbreak is closing, Dr. Tom Frieden said Tuesday.
CMS concedes HealthCare.Gov "won't be perfect" during next enrollment.
A new ad campaign features more tragic and gory details of the consequences of smoking.
"It's getting worse," said Obama. "It's spreading faster and exponentially.
The two will be transported on a noncommercial aircraft to ensure isolation.
The "Level 3" warning comes as the death toll hits 729 in West Africa.
A study says people can face increased expenses years after being cancer free.