food and medical aid into Homs have become a test case on whether peace talks in Switzerland can produce any practical results almost three years into the Syrian conflict In pictures: Syria's escalating refugee crisis Syria refugee crisis Boys walk along a street past damaged buildings and vehicles in the besieged area of Homs In pictures: Syria's escalating refugee crisis Syria refugee crisis Syrians stand in a destroyed street following a reported airstrike by government forces on the northern Syrian city of Aleppo In pictures: Syria's escalating refugee crisis Syria refugee crisis Rescue teams search for survivors on the rubble of a building following Syrian government air raids in the northern Syrian city of Aleppo In pictures: Syria's escalating refugee crisis Syria refugee crisis A graveyard in thenorthern Syrian city of Aleppo In pictures: Syria's escalating refugee crisis Syria refugee crisis A view of destruction in Aleppo's ancient Umayyad mosque, in the UNESCO-listed northern Syrian city. The mosque's minaret was blown up during clashes between opposition and government forces In pictures: Syria's escalating refugee crisis Syria refugee crisis Syrians attend the funeral of victims who reportedly died of hunger in the besieged Yarmuk Palestinian refugee camp in southern Damascus In pictures: Syria's escalating refugee crisis Syria refugee crisis A man holds the corpse of one-year old baby Adbul Jalil Mohamed Hamis wrapped in shrouds, who reportedly died of hunger in the besieged Yarmuk Palestinian refugee camp in southern Damascus during a funeral ceremony

The water-borne intestinal disease, which mostly affects children, can kill quickly if not