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30% of male aedes aegypti mosquito's carry dengue virus JAKARTA - Researchers at the Indonesian Mosquito Control Association have discovered that 30 percent of male Aedes aegypti mosquito's have also become a vector for the dengue virus. This finding has changed the long-standing perception that only female Aedes aegypti mosquito's carried the virus. This finding also signals that the disease is becoming endemic in Indonesia, according to Dr. Tri Baskoro, secretary general of the association.

"It is believed the male mosquitoes were infected through vertical transmission of the virus: the mother mosquitoes infecting their eggs," he said. Current knowledge assumed that only female mosquito's transferred the virus from person to person by bringing infected blood. They need human blood to form their eggs, while male mosquito's obviously don't have this need. "This discovery will be studied further to establish the pattern of the dengue virus` spread in the long term so that the right anticipatory steps can be taken."

The study is organized by the Indonesian Mosquito Control Association and was performed with male mosquito's caught in a number of regions in the country. The insects were tested for the virus. "The implication of this discovery is that the risk of dengue becoming endemic in this country has become greater," said Baskoro.


Related blog entries (category 'Dengue Fever') Related blog entries (category 'Dengue Fever'):
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17 February 2007 · Jakarta declares 88 areas 'dengue red zone'
14 February 2007 · Dengue fever kills 307, sickens over 20,000 in Indonesia
10 February 2007 · Dengue fever kills 252 in Indonesia

Related blog entries (category 'Dengue Fever') Tags: dengue fever, dengue, carry, percentage, aedes, mosquitoes, what


Posted in Dengue Fever @ 20 May 2007 07:15 CET by Jeroen · 'Blog' RSS feed · permalink





ukwong
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(Moderated) Posted @ 21 May 2010 05:59

The mosquito goes through four separate and distinct stages of its life cycle and they are as follows: Egg, Larva, pupa, and adult. Each of these stages can be easily recognized by their special appearance. There are four common groups of mosquitoes living in the Bay Area. They are Aedes, Anopheles, Culex, and Culiseta.

Egg : Eggs are laid one at a time and they float on the surface of the water. In the case of Culex and Culiseta species, the eggs are stuck together in rafts of a hundred or more eggs. Anopheles and Aedes species do not make egg rafts but lay their eggs separately. Culex, Culiseta, and Anopheles lay their eggs on water while Aedes lay their eggs on damp soil that will be flooded by water. Most eggs hatch into larvae within 48 hours.

Larva : The larva (larvae - plural) live in the water and come to the surface to breathe. They shed their skin four times growing larger after each molting. Most larvae have siphon tubes for breathing and hang from the water surface. Anopheles larvae do not have a siphon and they lay parallel to the water surface. The larva feed on micro-organisms and organic matter in the water. On the fourth molt the larva changes into a pupa.

Pupa : The pupal stage is a resting, non-feeding stage. This is the time the mosquito turns into an adult. It takes about two days before the adult is fully developed. When development is complete, the pupal skin splits and the mosquito emerges as an adult.

Adult : The newly emerged adult rests on the surface of the water for a short time to allow itself to dry and all its parts to harden. Also, the wings have to spread out and dry properly before it can fly.

The egg, larvae and pupae stages depend on temperature and species characteristics as to how long it takes for development. For instance, Culex tarsalis might go through its life cycle in 14 days at 70 F and take only 10 days at 80 F. Also, some species have naturally adapted to go through their entire life cycle in as little as four days or as long as one month.





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