An outbreak of cholera in West Africa has infected more than 13,000 people and killed at least 258 people in Sierra Leone and Guinea, authorities said as they appealed for international assistance. Sierra Leone\'s President Ernest Bai Koroma has declared the outbreak there an \"emergency issue,\" and has set up a task force to prepare the budget that will be needed to stem the outbreak. She said that in the capital, Freetown, there have been about 100 deaths during the past month, especially in congested areas. That brings the total to at least 176 dead in Sierra Leone, while 82 deaths have been reported in neighbouring Guinea. \"It is important to request help from the international community in order to spread the mobilization of resources,\" she said. Cholera is an infection of the small intestine, contracted by eating or drinking contaminated food or liquids. It can cause acute diarrhoea and vomiting and can kill within hours.