ADDIS ABABA, Nov. 8 (Xinhua) -- The World Health Organization (WHO) has stressed the crucial need to maintain and sustain dengue fever surveillance activities in Ethiopia. The WHO, in its periodic bulletin on outbreaks and other emergencies on the African continent issued late Tuesday, said since early April this year, Ethiopia has been grappling with a dengue fever outbreak which was initially reported in the Logia and Mille districts within the Afar region and has now spread into three more regions. Although the current trend for dengue fever is declining, it is crucial to maintain and sustain surveillance activities. The WHO warned that the ongoing dengue fever outbreak in Ethiopia is one of several concurrent outbreaks that the East African country is facing, including cholera, COVID-19, malaria, and measles. The WHO also warned that the current climate change led by the El Nino phenomenon could extend the transmission period of major vector-borne diseases including dengue fever.