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Sunday, April 12, 2009
Wednesday, May 21, 2008
facts for dengue
Fast facts about the mosquito
- Only the female aedes mosquito bites as it needs the protein in blood to develop its eggs.
- The mosquito becomes infective approximately 7 days after it has bitten a person carrying the virus. This is the extrinsic incubation period, during which time the virus replicates in the mosquito and reaches the salivary glands.
- Peak biting is at dawn and dusk.
- The average lifespan of an Aedes mosquito in Nature is 2 weeks
- The mosquito can lay eggs about 3 times in its lifetime, and about 100 eggs are produced each time.
- The eggs can lie dormant in dry conditions for up to about 9 months, after which they can hatch if exposed to favourable conditions, i.e. water and food
Tuesday, May 20, 2008
Dengue
The mosquito is a disease carrier and an irritant, but the mosquito is not impossible to control. Understanding mosquitoes biology and the mosquito breeding cycle can result in effective pest control for mosquito infestiation. This pesky mosquito is found worldwide. The mosquito affects humans only in their adult stage, all other mosquitoes stages occur in water. There are about three thousand species of mosquitoes worldwide, approximately 170 species in North America. Breeding sites, biting preferences, time of day they bite and ability to transmit diseases vary with the species.Mosquitoes undergo complete metamorphosis, egg, larvae (top left,) pupae (center) and adult (bottom) The adult male feeds on nectar and is important only for mating. The female usually must have a blood feast in order to produce viable eggs and that is where the problems begin. They feed on mammals, and humans are among some species favorites. This is annoying and at times unbearable, but not as scary as the diseases some are able to carry. Certain female mosquitoes are capable of being vectors (disease carriers,) of Malaria, West Nile Virus, Yellow Fever, Dengue, and Dog Heartworm.
Breeding occurs with mosquitoes in any area there is standing water such as stagnant ponds, discarded tires, tree stumps, etc. The more rainfall per season, the more numerous the mosquitoes. With mild winters and excessive rainfalls the possibility of a troublesome mosquito season is more likely.Complete development from egg to adult varies with species and temperature, but usually takes from 10-14 days. Once the eggs hatch into larvae or wigglers they begin feeding on algae and other organic matter in the water. The larvae develop through four molts and pupate. The pupae do not feed but are mobile spending much of their time near the water surface to breathe, and after one to three days emerge as an adult. The adults mate 24-48 hours after emergence.
The male dies after six or seven days, the female, depending on the species, lives from two weeks to 3 months during the summer. Once she has had a blood meal she will lay her first and largest brood of 50-500 eggs. Subsequent broods will be smaller but there will be 8-10 broods.Consider an average brood of 200 eggs per brood and that this insect can complete its development in less than two weeks, we can obtain in only five generations some 20 million of these pests. For mosquito control. For mosquito products.
Breeding occurs with mosquitoes in any area there is standing water such as stagnant ponds, discarded tires, tree stumps, etc. The more rainfall per season, the more numerous the mosquitoes. With mild winters and excessive rainfalls the possibility of a troublesome mosquito season is more likely.Complete development from egg to adult varies with species and temperature, but usually takes from 10-14 days. Once the eggs hatch into larvae or wigglers they begin feeding on algae and other organic matter in the water. The larvae develop through four molts and pupate. The pupae do not feed but are mobile spending much of their time near the water surface to breathe, and after one to three days emerge as an adult. The adults mate 24-48 hours after emergence.
The male dies after six or seven days, the female, depending on the species, lives from two weeks to 3 months during the summer. Once she has had a blood meal she will lay her first and largest brood of 50-500 eggs. Subsequent broods will be smaller but there will be 8-10 broods.Consider an average brood of 200 eggs per brood and that this insect can complete its development in less than two weeks, we can obtain in only five generations some 20 million of these pests. For mosquito control. For mosquito products.
Monday, May 19, 2008
Dengue Fever
Dengue Fever and Dengue Haemorrhagic Fever (a more severe form) are the most common mosquito-borne viral diseases in the world.
Dengue Fever is an illness caused by infection with a virus transmitted by the Aedes mosquito. There are four types of this virus (serotypes 1 to 4) which can infect you.
Dengue Fever is spread though the bite of the Aedes MosquitoThis infectious disease is manifested by a sudden onset of fever, with severe headache, muscle and joint pains (myalgias and arthralgias—severe pain gives it the name break-bone fever or bonecrusher disease) and rashes. The dengue rash is characteristically bright red petechiae and usually appears first on the lower limbs and the chest; in some patients, it spreads to cover most of the body. There may also be gastritis with some combination of associated abdominal pain, nausea, vomiting or diarrhea.
Other symptoms include:
• fever;
• bladder problems;
• constant headaches;
• severe dizziness; and,
• loss of appetite.
best regards
不测了俄
Dengue Fever is an illness caused by infection with a virus transmitted by the Aedes mosquito. There are four types of this virus (serotypes 1 to 4) which can infect you.
Dengue Fever is spread though the bite of the Aedes MosquitoThis infectious disease is manifested by a sudden onset of fever, with severe headache, muscle and joint pains (myalgias and arthralgias—severe pain gives it the name break-bone fever or bonecrusher disease) and rashes. The dengue rash is characteristically bright red petechiae and usually appears first on the lower limbs and the chest; in some patients, it spreads to cover most of the body. There may also be gastritis with some combination of associated abdominal pain, nausea, vomiting or diarrhea.
Other symptoms include:
• fever;
• bladder problems;
• constant headaches;
• severe dizziness; and,
• loss of appetite.
best regards
不测了俄
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