The Syrian American Medical Society (SAMS) said four patients have been taken to hospitals in Damascus, the first of 29 critical cases approved for medical evacuation, and that the remainder would be evacuated over the coming days.
Daesh fighters are moving house to house through holes knocked in inner walls to avoid air surveillance. It is a battle that is being fought street by street as Iraqi forces attempt to retake Mosul.
The disease is suspected to have left some 8,500 people ill in over two weeks as hospitals struggle to cope with an influx of patients, the Red Cross says.
The world only has a "window of three to four months" to save millions in the two countries, according to the humanitarian organisation.
ICRC puts its aid operations across Afghanistan "on hold" after the attack. The ICRC employees were slain while they were carrying supplies to avalanche-hit areas in the north of Afghanistan.
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