Friday, July 6, 2012

Dengue Fever Symptoms - Dengue Fever Prevantion

What is Dengue Fever:
Malaria fever prevention save from mosquito (female) bite. Clean your environment through sprays, mats and coils. Clean houses frome dirty waters. Dengue is a disease in humans caused by a virus transmitted by mosquitoes. It usually occurs in tropical and subtropical areas of the world, mainly in the cities and suburbs. This is the most important disease of human viral timber, affecting 5 to 10 people per year (Gubler, 2000). Dengue words are an attempt by the Spanish Swahili phrase ki Denga pepo, which describes an attack like cramps.

The Viruses
Human dengue can be caused by four similar but closely related viruses of the family Flaviviridae. Because viruses are defined based on serological responses, are called dengue “Serotype” (DEN-1, DEN-2, DEN-3, and DEN-4). Four serotypes of dengue are sufficiently different that the infection is a type does not have immunity to infection in others, so people can be infected several times (first infection is called primary, secondary after). There is some evidence that secondary infections are more likely to develop a more severe manifestation of the disease known as dengue hemorrhagic fever (DHF), through a mechanism known as an improvement of employees (ADE), which means please, and replication virus during secondary infection (Cummings et al. 2005).
Humans and other primates are the only known vertebrate hosts of dengue infection naturally. Although the location of the forest of dengue fever, which usually affects wild primates are genetically different from strains endemic / epidemic infecting humans in general, both groups may be infected or deformation.

The Vectors
The most important vector of dengue and yellow fever mosquito Aedes aegypti, but the tiger mosquito, Aedes albopictus is also a competent vector and can act as a bridge vector of arboviruses interhabitat (Lourenço de Oliveira et al. 2004).
Ae. aegypti mosquito is a medium sized black with black and white striped legs and a silvery-white lyre-shaped pattern of scales on the dorsal side of the chest (Figure 1). With roots in Africa, AE. aegypti is now a cosmopolitan area, which extends from 30 degrees N to latitude 35 ° S. Before the arrival of Ae. albopictus in North America in 1980, AE. aegypti mosquitoes was a regular throughout the U.S. Southeast. Now occurs mainly in urban areas in southern Florida, southern Louisiana and southern Texas, and is sometimes found in neighboring countries and also in Arizona, where conditions are generally too dry for the establishment of Ae. albopictus populations.


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