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For scientific commercial, For Scientific American Science quickly, I'm Rachel Feldman.

Instead of going through a series of news stories you might have missed last week, we're going to focus on one major headline today.

The number one priority of our foreign policy is to protect the American people.

We cannot and will not allow any cases of Ebola to enter the United States.

That was U.S. Secretary of State Marco Rubio speaking at a cabinet meeting on May 27th. On May 15th,

health officials from the Democratic Republic of the Congo declared that the country was in the

midst of an Ebola outbreak. Two days later, the Director General of the World Health Organization

designated the spread of Ebola in the DRC and Uganda as a public health emergency of international concern.

Here to tell us more about this developing crisis, and to explain why the response outlined by Rubio is a massive, dangerous departure from the way the U.S. has historically dealt with Ebola outbreaks is Tanya Lewis.

Tanya is senior desk editor for

Health and Medicine at Scientific American. Tanya, thanks for joining us.

Thanks so much for having me. So for listeners who, you know, were maybe distracted by other

outbreak news, of course, the last time we had you on, we were talking about hantavirus.

How long has this Ebola outbreak been going on?

...