Based on reports from the Philippine Department of Health, Dr. Cheng estimates that dengue fever has killed 1,656 people and infected 32,887 in the Philippines from 1995 to 1998. Globally, WHO says there are 50 to 100 million cases of dengue fever, two thirds in South Asia and the Southeast Asia region. The global prevalence of dengue fever has grown dramatically in recent decades, and epidemics are larger and more frequent, Dr. Cheng said. But reintroduction would not be easy, Professor Ligat says, since these insects breed in freshwater ponds and swamps, which are rare nowadays in the Philippines, because of pollution and deforestation. Damselflies belong to the suborder Zygoptera and dragonflies to suborder Anisoptera of the order Odonata.
Damselflies are smaller and slender compared to dragonflies.
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