JOHANNESBURG – More than 10,000 people in West Africa are believed to have contracted Ebola in the biggest outbreak of the deadly disease, and nearly 5,000 have died, according to the latest World Health Organization report, amid concerns about a potential spread of the disease in Mali.Fears rose about how many people may have been infected by a 2-year-old girl before she died Friday in Mali.The child was taken by her grandmother from Guinea to the western Mali town of Kayes by bus, a journey of almost 700 miles. The child was symptomatic — and therefore infectious — for much of the journey, according to the WHO. For part of the trip she was bleeding from the nose.Malian authorities have traced 43 people who were in contact with the child, including 10 health-care workers. But the long journey by public transport raises the possibility that some people who may have been infected will be difficult to trace.The WHO sent experts and equipment to Mali in a bid to ensure the outbreak doesn’t get out of hand. Though Malian President Ibrahim Boubacar Keita said Saturday that all the girl’s contacts had been found and were being monitored, the WHO said they were tracing further contacts.According to Keita, the dead girl’s grandmother went to a funeral in Guinea. Burials of Ebola victims carried out without proper safeguards are one of the main means of the transmission of the virus in West Africa.