Obama calls for calm amid US Ebola fears

Three people have now been diagnosed with the hemorrhagic fever in the United States.

FILE: A medical transport van moves past Texas Health Presbyterian Hospital Dallas where a patient has been diagnosed with the Ebola virus on 30 September, 2014 in Dallas, Texas. Picture: AFP.

NEW YORK - United States (US) president Barack Obama has called for calm, amid fears of an Ebola outbreak in that country.

A second nurse, who treated the country's first patient to die from the disease, contracted it too.

A third case has just been confirmed as well.

Obama cancelled a campaign trip to meet with agencies co-ordinating the government's response to the outbreak.

He has tried to quell fears assuring the public that the Centre for Disease Control (CDC) would be sending rapid response teams to any site within the US where an Ebola diagnosis was made.

It's emerged the nurse, Amber Vinson, flew on a commercial flight the day before she presented symptoms and the CDC is working to find out if any of the 132 passengers have symptoms too.

The CDC is also investigating how Vinson was allowed to board the flight, despite having a fever and says she should never have been allowed to fly.

Attempts are now being made to track down and interview the other travellers and monitor them for symptoms.

Officials say there is a low risk of contraction, but they're reaching out to people nonetheless as part of "extra margins of safety".

The global death toll is now above 4,000 with countries such Liberia, Guinea and Sierra Leone most affected by the hemorrhagic fever.