A young boy sits inside a hand out mosquito net given to his family by members of the Roll Back Malaria Expedition at a village on the Zambezi River near Livingston , Zambia , 23 April 2008 . The Roll Back Malaria Expedition is traveling down the Zambezi River from it ' s source in Angola so as to hand out malaria nets and educational talks to villagers along the river banks . World Malaria Day will be marked on Friday 25 April . EPA / KIM LUDBROOK < 저작권자 ⓒ 2007 연 합 뉴 스 . 무단 전재 - 재 배포 금지 . >