Numbers released on Tuesday by WHO include about 200 new cases since data was published yesterday. More than 6,000 people have died. The vast majority of the infected are in Guinea, Liberia and Sierra Leone.

Also on Tuesday, Sierra Leonean Health Ministry Spokesman Jonathan Abass Kamara said that Dr. Thomas Rogers has tested positive for the disease and was admitted a day earlier to the British-built treatment center in Kerry Town, near the capital. Rogers had been working at Connaught Hospital in Freetown.

He is being cared for at a special clinic reserved for infected health care workers that is staffed by British army medics. The WHO has sharply revised down its tally of Ebola deaths in Liberia, after a jump of more than 1,000 in the death toll there.

The UN health agency said late on Monday that 3,145 people in Liberia had died from the disease, which is also hitting neighboring Guinea and Sierra Leone hard.

Figures published Friday put the death toll at 4,181, a jump of more than 1,000 deaths from two days earlier.

Spokesman Tarik Jasarevic said on Tuesday that the Friday toll mistakenly included non-Ebola deaaths.

The agency has said data from the outbreak has been difficult to get and there have been big swings in the numbers, as cases are reclassified or backlogs cleared.

The latest data show 5,987 people have died in the three worst affected countries.

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