As the Ebola virus outbreak continues, the World Health Organization said that the number of the dead and illness cases of Ebola in West Africa have been vastly underestimated.

With more than 1,069 deaths and 1,975 sick, the Ebola virus outbreak is already the deadliest ever.

"Staff at the outbreak sites see evidence that the numbers of reported cases and deaths vastly underestimate the magnitude of the outbreak," WHO said.

On Thursday, Director-General Margaret Chan of WHO held a meeting with a group of Ambassadors of Geneva's United Nations missions, and discussed necessary measures to be taken to lessen the number of the Ebola virus outbreak.

Furthermore, the U.S. State Department ordered families of embassy personnel to leave Sierra Leone on Thursday because of the Ebola virus outbreak and the fear that it might make it difficult to get treatment.

However, the health officials in Liberia received doses of an experimental Ebola treatment drug from the United States called ZMapp. The drug has already been administered to two infected American aid workers. A Spanish priest who had also begun taking the experimental drug became the first European to surrendered to the virus this year when he died on Tuesday.

Meanwhile, several airlines have suspended flights to infected countries, but WHO clarified that "air travel, even from Ebola affected countries, is low risk for Ebola transmission" because the virus is not airborne.

The Ebola virus outbreak continues to threaten a vast number of people, and for that, health experts say that the government responses to the virus need to be calibrated to prevent its spread, while avoiding measures that could induce panic in the economy.