Why can t mosquito bites transmit AIDS, then how can needles transmit it?

This is because HIV is not transmitted when the amount of HIV is too small.

Hello, at room temperature, HIV can survive for 15 days in a liquid environment, and HIV-contaminated items are contagious for at least 3 days. HIV has very poor survivability outside the human body, does not tolerate high temperatures, has low resistance, and is not easy to survive without the human body, and can only survive for a few hours to a few days at room temperature. HIV is sensitive to heat.

It loses activity after 30 minutes at 56 conditions, but remains active after 7 days at room temperature. Don't forget to adopt it.

Suggestion: AIDS cannot be transmitted by mosquitoes. The first is because the HIV virus cannot replicate in insects, and the virus cannot survive long enough in mosquitoes to spread through saliva.

HIV requires the body's T cells, which can only survive and replicate in them. Mosquitoes do not have this special T cell, so after HIV enters the mosquito, it cannot survive, let alone replicate. Even if HIV enters the mosquito, it loses its vitality in the midgut of the mosquito.

Therefore, the mosquito cannot transmit HIV on the next bite.

The average person may have read the popular science education that mosquitoes transmit diseases, and there are roughly two ways of transmission: biological transmission and mechanical transmission. The so-called biological transmission refers to the pathogen that goes through the stage of development and multiplication in the mosquito body, and then transmits it to humans.

For example, the Japanese encephalitis virus (JV) is inhaled into mosquitoes with bloodstream, multiplies in their intestines, and then migrates to the salivary glands, where they are bitten and transmitted to humans or animals.

HIV neither develops nor multiplies in mosquitoes, so it is impossible to transmit it biologically. Mechanical transmission, in the case of AIDS, is not feasible. This is because mosquitoes suck out saliva through the salivary duct (which acts as a lubricant to suck blood) before sucking blood, and then sucks blood through another tube, the esophagus.

The inhalation of blood is unidirectional, and it is no longer spit out of the esophagus after inhalation. There are concerns that residual blood from mosquitoes' mouths may carry HIV and can be transmitted to humans. However, some studies have found that the amount of residual blood on the mosquito's mouth is only milliliters, and if this is calculated, it would take 2,800 bites to carry enough virus to cause HIV infection.

Moreover, when the blood carrying the HIV virus is inhaled by the mosquito, the HIV virus is digested by the mosquito within 2-3 days, destroyed and completely disappears. Once the mosquito has sucked the blood, it will not bite or suck the blood until it is completely digested. Therefore, the possibility of mosquito transmission of AIDS can be said to be non-existent, regardless of the route.