When a mosquito quietly lands on your skin, you may just feel a slight itch, but you rarely realize that you have just undergone a process comparable to “micro-surgery”. Mosquitoes’ blood-sucking is not only complicated, but also harbours fatal risks. They will not only steal a few drops of blood, but may also take away your health or even your life.
In this article, we’ll uncover the science behind mosquitoes’ blood-sucking behavior, the dangers they pose, and why humans can’t completely eliminate them. Finally, we’ll share some simple, effective ways to protect yourself from them in the summer.
Why do mosquitoes always target humans?
Mosquitoes do not have a special liking for everyone. They choose their prey based on scientific evidence. Female mosquitoes need the protein in blood to complete the development of their eggs, and human blood is a high-quality “nutrient solution.”
How do they lock onto their targets? They rely mainly on their sense of smell and heat sensing systems. Scientific research has found that mosquitoes are highly sensitive to carbon dioxide, body temperature, and the smells of lactic acid, amino acids, etc. emitted by the human body. In other words, when you are sweating profusely in the hot summer, or panting after exercise, you become the number one target of mosquitoes.
Microsurgery: A precise blood-sucking process
A mosquito bite is not simply a “prick of the needle”. In fact, the process is more sophisticated and more terrifying than you think.
Step 1: Site selection
When a mosquito lands on your skin, it uses the small flap at the end of its mouthparts to probe around, looking for the ideal place to insert a needle, usually near a blood vessel.
Step 2: Anesthesia and Defense
After finding the “target”, the mosquito first secretes saliva containing a variety of chemical components. These components include:
Anesthetic : It makes you unable to feel the needle prick until it is absorbed and leaves.
Anticoagulant : prevents blood from clotting and ensures smooth blood sucking process.
Step 3: Six-needle collaboration
The mosquito’s “needle” is actually a set of delicate structures composed of six thin tubes:
The two outer blades are like “micro serrated knives” and are responsible for cutting the skin.
The two inner wires hold the incision open to prevent closure.
One continuously infuses an anticoagulant.
The last one goes deep into the blood vessels, like a straw, sucking blood into the body continuously.
The whole process lasts about 3 minutes and you hardly notice it.
How big is a mosquito’s appetite?
How much blood can a mosquito suck? The answer is – amazing. The elasticity of the mosquito’s abdomen allows it to suck blood equivalent to three times its own body weight. If it were a human, it would be equivalent to an adult male drinking nearly 300 kilograms of water at one time.
After sucking its fill, the mosquito’s body will swell to several times its original size, looking like a small “blood sac”. Only then will it contentedly pull out the needle and fly away.
Why do you itch?
Many people think that the stinging sensation comes from the needle prick, but this is not the case. The real reason for the itching is that the protein in the mosquito’s saliva triggers an immune response. When the anesthetic component wears off, the skin begins to become inflamed, causing redness, swelling and itching. If the mosquito is a “novice”, it will be clumsy when biting, the wound will be larger and the red spot will be more obvious.
Hidden deadly risks: Why mosquitoes become “killers”?
If itchy skin is just a minor annoyance, then the viruses carried by mosquitoes are the real nightmare. They are the most disease-transmitting animals known, causing more than 700,000 deaths each year , surpassing sharks, snakes, and even humans themselves.
Common mosquito-borne diseases include:
Malaria : One of the world’s deadliest parasitic diseases.
Dengue fever : Widespread in tropical regions, it can be fatal in severe cases.
Yellow fever, Zika virus, West Nile virus : long-term threats to public health.
Mosquitoes are so efficient because they switch hosts so frequently: one meal might be an animal, the next might be you, providing a perfect way for viruses to jump from one species to another.
Why can’t we get rid of mosquitoes?
If mosquitoes are so dangerous, why don’t humans just wipe them off the face of the earth?
Scientists point out that it is almost impossible to completely eliminate mosquitoes for several reasons:
Long history of survival : Mosquitoes have existed on Earth for 170 million years, which is older than dinosaurs.
The reproductive capacity is amazing : there are about 100 trillion mosquitoes in the world, and a female mosquito can lay hundreds of eggs in her lifetime.
Their ecological role is complex : they are an important food source for birds, bats, and fish, and their complete elimination may cause ecological imbalance.
In addition, global mosquito eradication efforts require huge amounts of money and technology, and once the campaign is relaxed, mosquito populations will quickly rebound.
Human defense strategies: What can we do?
Although we cannot completely eliminate mosquitoes, we can reduce the risk. Scientific research shows that mosquitoes rely on the olfactory system to locate targets, so interfering with their sense of smell is an effective means. Here are some practical tips:
Keep clean : Wash away sweat promptly to reduce body odor.
Use mosquito repellent : Products containing DEET or Picaridin are most effective.
Improve the environment : remove stagnant water and reduce mosquito breeding sites.
Installing window screens : simple yet extremely effective.
Use natural mosquito repellent plants : such as lemongrass and mint, but the effect is limited.
If you live in an area with a high incidence of mosquito-borne diseases, vaccinations (such as the yellow fever vaccine) and the use of bed nets are the most important prevention measures.
Conclusion: Mosquitoes, tiny but deadly
Mosquitoes may seem insignificant, but they are the deadliest animals in the world. They use six tiny needles to perform delicate “surgery” and spread diseases to hundreds of millions of people while sucking blood. Even so, we still cannot completely eliminate them, and can only rely on science and daily protection to coexist.
The question is: If you were given a superpower that prevented mosquitoes from ever finding you, how much would you be willing to pay?