The number of cases in the Ebola outbreak has exceeded 10,000, with 4,922 deaths recorded as of October 23, according to a World Health Organization report published Saturday.

Of the 10,141 reported cases, 450 are healthcare workers, more than half of them in Liberia with three in the United States. A total of 244 healthcare workers have died of the disease.

Outside of the three most affected countries in West Africa—Sierra Leone, Guinea and Liberia—there have been only 27 reported cases of the deadly illness.

In New York and New Jersey, governors Andrew Cuomo and Chris Christie have implemented controversial quarantines on all healthcare workers returning from West Africa after a doctor returning from Guinea contracted the disease and was diagnosed in New York.