Only the female Aedes mosquito bites, as it needs the protein in blood for its eggs to develop. The mosquito becomes infective approximately seven 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 two weeks.
The larvae are aquatic, meaning that they live in the water and feed on microorganisms found in the water. Larvae go through developmental stages in which they molt, or shed their skin, three times.
These larval stages are called the first to fourth instars. When a larva is a fully grown fourth instar, it undergoes metamorphosis into a new form called a pupa, the "cocoon" stage for the mosquito. This stage of the mosquito's life is also aquatic. After two days, the fully developed adult mosquito forms and breaks through the skin of the pupa.
The adult mosquito is able to fly and is no longer aquatic. It has a terrestrial habitat. What happens if there is no rain? Aedes aegypti mosquitoes have adapted so that their eggs can survive dry conditions for several months. If eggs are laid in a dry container, new mosquitoes only develop when the container is filled with water. This adaptation has made it very difficult to eliminate mosquito populations completely.
In many areas of the world, dengue outbreaks occur every year during the rainy season, when conditions are perfect for mosquito breeding. Dengue can pose a particular threat in highly populated regions because epidemics are more likely where there are large numbers of people in contact with large numbers of mosquito vectors than in more isolated areas.
In countries in the equatorial zone that experience tropical monsoon seasons — such as Indonesia, India, Brazil, Thailand, Sri Lanka, and Myanmar — dengue epidemics are a serious public health problem.
Alameda County Mosquito Abatement District. Centers for Disease Control and Prevention. Dengue Virus Net. Aedes aegypti Kuno, G. Rodhain, F. Aa Aa Aa. Dengue Transmission. The risk of contracting dengue infection has increased dramatically since the s. This upward trend is due to increases in long-distance travel, population growth and urbanization, lack of sanitation, ineffective mosquito control, and increases in the surveillance and official reporting of dengue cases.
Dengue is an endemic disease, which means that it occurs regularly, in tropical regions of the world.
The disease is endemic in more than one hundred countries in Africa, the Americas, Asia, the Caribbean, and the Pacific. How does dengue spread, and how is this disease transmitted to humans? How Does Dengue Spread? Aedes Mosquitoes. Figure 1: Aedes aegypti.
Aedes aegypti is the principal vector responsible for dengue transmission. How Is Dengue Transmitted to Humans? Figure 2: Dengue transmission. The dengue virus is spread through a human-to-mosquito-to-human cycle of transmission.
Dengue Mosquito Life Cycle. Figure 3: Aedes aegypti life cycle. Female Aedes aegypti commonly lay eggs on the inner walls of artificial containers.
The dengue virus is spread through a human-to-mosquito-to-human cycle of transmission, with the mosquito Aedes aegypti as the primary vector. These mosquitoes live near humans in tropical and subtropical regions of the world. Female Aedes aegypti become dengue vectors after feeding on the blood of a person infected with the dengue virus. Infected mosquitoes continue to transmit dengue with each blood meal for the rest of their lives. Aedes aegypti have a complex life cycle that includes aquatic and terrestrial stages.
These mosquitoes lay their eggs inside containers, and new Aedes aegypti hatch when the containers are filled with water. Dengue poses the greatest risk in highly populated regions with rainy seasons where there are large populations of Aedes aegypti with a high degree of contact between the mosquitoes and humans. World Health Organization. Over the past weeks, there's been an incessant rise in the number of dengue cases being reported across the countries.
While the erratic monsoons and seasonal changes are major reasons behind the rise, dengue cases are also becoming severe, because of the newer variants in circulation. Nonetheless, while we do not have a vaccine ready for use, what really plays a crucial role is to prevent the dengue infection from spreading in the first place and mitigate possible risks. But how can you identify what exactly is a dengue mosquito? The dengue virus, spreads through the virus infected aedes aegypti mosquito bites.
With an infection as such, which spreads primarily via mosquito bites, it can be incredibly hard to distinguish between a normal mosquito bite and dengue mosquito bite. Having said that, we provide some possible clues, and help educate you about how a dengue infection can start to spread, and avoid the risk:.
The dengue mosquitoes also tend to be the most active during the daytime, and it is said that the most likely chances of infection happen during the morning and afternoon hours. As per studies, the mosquito is most active during the daytime, approximately two hours after sunrise and several hours before sunset. However, rarely though, they can also happen to bite people post sunset. Another stark feature for these dengue bites is the place where the mosquito bites a person.
With dengue, it is said that the infected mosquitoes target body parts like around the ankles, elbows. It should also be remembered that a single bite of the mosquito is enough to infect an individual and span across symptoms. As confusing as it could be, not every mosquito bite can, or could cause dengue right now. Dengue infection is particularly spread by the bite of the Aedes aegypti mosquito, and they mostly surge during tropical climates, and cannot survive during winters.
One possible recognition sign of the dengue causing virus could be dark and white coloured markings on the lower half of the body, and the legs. While the dengue-spreading viruses lay eggs in places which have water, what's also peculiar about them is that only the female dengue viruses are capable of biting humans and animals and causing the infection. Identifying or differentiating between mosquito bites, more so after they have bitten a person can be vague and difficult.
While prevention really is the best way to avoid catching a seasonal infection like dengue, if a mosquito bites you, it is said that the bite area can appear more starkly red, and itchier than a usual mosquito bite. The incubation period of the dengue virus, i. However, experts say that the symptoms can show up anywhere after that, and cause different signs and symptoms, depending on your risk factors, age and pre-existing illnesses.
With dengue fever, there's also severity associated with the current DENV-2 strain of the virus. Just as crucial it is to take note of possible signs of worsening, knowing, and acting on early signs can prompt the right diagnosis.
The most common early signs of the infection include:. It should be remembered that dengue remains to be an infection best fought with preventive care, and can be completely avoided as long as there's good hygiene practices being followed. To protect yourself during the current rampant dengue season, here are a few things which should be done at the earliest:. Please Click Here to subscribe other newsletters that may interest you, and you'll always find stories you want to read in your inbox.
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