A toddler who brought Ebola to Mali was bleeding from her nose during her journey on public transport and may have infected many people, AP cited the World Health Organization as saying.
WHO said it is treating the situation in Mali as an emergency.
The 2-year-old girl, who traveled from Guinea with her grandmother, tested positive for Ebola on Thursday. That makes Mali the sixth West African country to record a case of the disease.
WHO said Friday that the girl and her grandmother passed through several towns in Mali on their trip from Guinea and spent two hours in the Malian capital of Bamako before ending up in the western city of Kayes.