AlQa'dah 5, 1435, Aug 31, 2014, SPA -- Senegalese authorities traced the country's first Ebola case to a 21-year-old student from neighbouring Guinea and launched a broader investigation, dpa cited the World Health Organization (WHO) as saying Sunday. Senegal began an emergency investigation after it confirmed its first case of Ebola on Friday, making it the fifth country to be affected by the outbreak in West Africa. The infected patient is an unnamed man from Guinea, where the epidemic first erupted in December. He arrived in Senegal's capital, Dakar, by road on August 20, investigators found.