Twenty-one Cambodians had been killed by dengue fever as of August 16, compared with 43 by that point in 2008, according to a report from the National Anti-Dengue Programme (NADP). Ngan Chantha, director of the NADP, said the decline in deaths came despite the fact the number of dengue cases reported so far this year has almost doubled compared with the same period last year, from 4,955 to 8,268. He cautioned people to stay vigilant about sleeping under mosquito nets and maintaining proper sanitation, as dengue fever will remain prevalent until around October.