NEW YORK (AP) — U.S. health officials are monitoring the Ebola outbreak in Africa but say the risk of the deadly germ spreading to the United States is remote.

The Centers for Disease Control on Monday sent a health alert to U.S. doctors about the outbreak.

There are no travel restrictions to the West Africa region hit by the disease.

But last month, the CDC issued a mid-level travel advisory for health workers.

Two American aid workers in Liberia have tested positive for the virus and are being treated there.

One of those being treated is Ft. Worth Doctor, Kent Brantly.

Brantly’s family recently returned to the U.S. for a visit. The CDC said they are fine.

Brantly was flown into Atlanta Saturday in a specially equipped plane and was whisked away in an ambulance and able to walk under his own power into a Emory Hospital with one of the most sophisticated isolation units in the country, officials say.

Officials stressed people are not contagious until they show symptoms.

“Ebola is only transmitted through blood and bodily fluids,” said Dr. Jay Varkey, an infectious disease specialist.

“Unlike the flu, like influenza, which we deal with every winter, Ebola cannot be spread thorugh the air.”

Ebola begins with fever, headache and weakness and can escalate to vomiting, diarrhea and kidney and liver problems.

In some cases, patients bleed both internally and externally.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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