imageBAMAKO, Mali – Many people in Mali are at high risk of catching Ebola because the toddler who brought the disease to the country was bleeding from her nose as she travelled on a bus from Guinea, the World Health Organization warned Friday. The U.N. agency is treating the situation as an emergency since many people may have had “high-risk exposures” to the 2-year-old girl during her journey through several towns in Mali, including two hours in the capital, Bamako. The girl was travelling with her grandmother. The toddler died in an isolation tent at a hospital in the western city of Kayes on Friday, according to a nurse at the facility, who spoke on condition of anonymity because he was not authorized to speak to the press. This is the first Ebola case in Mali and may expand to many more. The case highlights how quickly the virus can hop borders and even oceans, just as questions are being asked about what precautions health care workers who treat Ebola patients should take when they return home from the hot zone. Doctors Without Borders insisted Friday, after one of its doctors who worked in Guinea came down with Ebola in New York, that quarantines of returning health workers are not necessary when they do not show symptoms of the disease. More