Residents have been urged to remain calm after a New York doctor, who had recently travelled to Guinea, tested positive for Ebola.

The WHO chief wasn’t told of the scale of the crisis until three months after it was detected and bureaucratic messes delayed deployment of vital aid, write Jason Gale and John Lauerman

President Barack Obama appointed an ebola tsar for the US, and the government said a Texas health worker who may have had contact with specimens from an ebola patient was isolated on a cruise ship.