Dengue fever has killed 13 people in 2009 as of Monday, with 10 of those deaths having occurred since the end of May, said Ngan Chantha, head of the National Anti-Dengue Programme and deputy director of the National Centre for Parasitology, Entomology and Malaria Control. He said there had been 4,529 total cases during that period, compared to 2,508 in the same period last year. He noted, however, that 28 deaths had been recorded at this point last year. "This means that our people are getting to know more about treatment," he said.