The unit was dispatched by the UN agency and Syrian Arab Red Crescent to treat residents hit by malnutrition in the rebel-held town of 40,000 besieged by pro-government forces for the past six months, said Rana Sidani, a WHO regional official.
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A convoy of 44 aid trucks loaded with food and medicine on Thursday entered Madaya -- where the United Nations says hardships are the worst seen in Syria's nearly five-year war.
Relief workers examined 350 residents of the town, located around 40 kilometres (25 miles) from the Syrian capital, and found multiple cases of severe malnutrition, Sidani told AFP.
A first convoy was allowed to enter Madaya on Monday after reports that more than two dozen inhabitants have starved to death since December sparked international alarm.