New York Ebola case: Mayor says 'no reason for alarm'

New York City Mayor Bill de Blasio has said "there is no reason for alarm", following news that a New York doctor who recently returned from Ebola-hit Guinea in West Africa had tested positive for the disease.

Dr Craig Spencer, who worked for the medical charity Medecins Sans Frontieres (MSF), came down with a fever on Thursday.

He is the first Ebola case diagnosed in New York, the largest city in the US.

During a news conference, the mayor emphasised that "Ebola is very hard to catch".