Epidemic control

Will mosquito bites spread AIDS?

Publishdate:2015-09-15 Views:160

There is no evidence that HIV can be transmitted by the bite of blood sucking insects.

Today, I received a phone call from a prison leader, who said: now the weather is hot and mosquitoes breed. They have detained more than 20 prisoners with HIV infection in their prison. Several policemen have been bitten by mosquitoes at work. They suspect that these mosquitoes have bitten these infected people before they bite them, so they want to apply for occupational exposure drug interdiction for these policemen. So, a mosquito in the bite of an AIDS infected person immediately after the bite of a healthy person, this will cause the spread of AIDS?

The answer is very clear: No.


First of all, we need to understand how arboviruses are transmitted by mosquitoes. The virus forms a certain concentration in the patient's blood. This period is called viremia period. During this period, the patient's blood is absorbed by mosquitoes and the virus is mixed in it. In the midgut (the main digestive organ of mosquitoes, accounting for most of the mosquito's belly), the virus slowly erodes the midgut cells infected by mosquitoes through some specific receptors, and then crosses the midgut barrier to enter the mosquito's circulatory system. Because mosquitoes are open circulatory systems, the virus can quickly infect the whole body of mosquitoes, and finally enter the mosquito's salivary glands, and a large number of them Proliferation, in mosquito saliva to a very high concentration, even higher than the patient's blood virus concentration. At this time, when it bites normal people, it will inject saliva into the blood vessels to achieve the purpose of anti hemagglutination and vasodilation. The high concentration of the virus then enters the human body. With the help of some substances in mosquito saliva, the virus can survive and reproduce in the human body.

When you understand this process, you can explain why mosquitoes can't spread AIDS. With the no HIV receptor in mosquito, virus can't invade midgut of the mosquito, let alone enter mosquito body, and finally excreta of the mosquito is discharged.

Well, the problem is coming again. If a mosquito bites an HIV infected person and immediately bites another person, will that person be infected. In fact, it's too much to worry about. Mosquitoes can not infect the virus by directly pricking the patient and then the healthy person. Laboratory studies have shown that blood sucking insects, including mosquitoes, never spit out blood they've inhaled before. In addition, there is no need to worry about the blood left in mosquito mouthparts, because a certain amount of HIV must enter the human body to be infected. But first, the level of HIV in the blood of AIDS patients will not remain very high for a long time. Second, the mouth organ of mosquitoes can not touch much blood. Third, HIV can not reproduce in mosquitoes, so the number of viruses is far from the level of infection. And entomologists say that after a mosquito is full on a person, it has to digest the blood to find the next target. After this period of time, HIV has long lost its ability to infect.

Most importantly, there is no evidence that HIV can be transmitted through the bite of blood sucking insects. Mosquitoes do spread some diseases (malaria, etc.) by biting, but those diseases are spread through mosquito saliva, and HIV does not. Of course, it should be said that strictly speaking, at least the species of mosquitoes found at present will not infect the HIV strains found at present to the vast majority of people, and it is not ruled out that in the future, the mosquitoes that can spread HIV or the virus strains that can spread through mosquitoes are found or made by which bastard. Or some unlucky egg can be infected by the little virus on the mouth that the mosquito hasn't wiped (after all, there is an exception in everything).

Source: medical infection channel