Exact scientific evidence tells us that there are three routes of transmission of AIDS, namely, blood route, sexual route and mother-to-child route. HIV is not transmitted through tableware, drinking water and food.
Both new rumors and old rumors mentioned "needles", and they were needles stained with the blood of AIDS patients. This seems reasonable, but it is not credible. Because HIV can only exist in liquid, in dry environment, the virus will die in 10 minutes and be inactivated at 56℃ for 30 minutes (that is, the virus no longer has physiological activity and loses its ability to infect, cause disease and reproduce). There is little blood on the needle and even less virus. At least the human body needs to take it.
It takes 200 viruses to cause infection.
The syringes used by AIDS patients may spread AIDS if they are stabbed in normal people, but even if they are stabbed in healthy people immediately, the probability of infection is only 0.33%. In beijing ditan hospital AIDS ward, after the nurse injected AIDS patients, the needle fell off and stuck on the nurse's foot. After 1 month, 3 months and 6 months of HIV antibody follow-up, no infection was found.
Reminder: Dangerous behaviors deserve attention.
Sharing syringes to take drugs is an important dangerous behavior in the spread of blood-borne AIDS.
Inputting or injecting blood or blood products contaminated by HIV will infect AIDS.
The use of syringes, acupuncture needles, razors and other instruments that invade the human body and are contaminated by HIV without disinfection may spread AIDS.
◆ Will saliva spread AIDS?
Li Hongjun, director of the Radiology Department of Beijing You 'an Hospital, said: "AIDS belongs to Class B infectious diseases designated by the Ministry of Health of China, that is, it does not belong to severe infectious diseases like SARS. It can spread through the respiratory tract. If a flu patient sits opposite us and chats face to face like this, it may be contagious for a while, but if it is AIDS, it will not be contagious for a long time. "
Li Hongjun said that the AIDS virus is highly dependent on the human environment, and it will soon lose its ability to spread diseases without the human body. Only when the virus reaches a certain number can it spread, and then it can be transmitted through the exchange of body fluids and blood.
◆ Will tears spread AIDS?
Li Taisheng, an expert in infectious medicine at Peking Union Medical College Hospital, found that after treatment, the tears of AIDS patients with HIV-negative blood still contained HIV. This research result was published in the international academic journal AIDS in September. Then, after numerous news media reports, tears may spread AIDS, or "tears are the fourth route of transmission of AIDS."
However, Li Taisheng said that their paper published in AIDS magazine wrote: "We have evidence that when the virus in blood is suppressed, there are still a lot of viruses in tears, and tears should be the repository of HIV." Li Taisheng pointed out that they proved that tears contain viruses, but it does not mean that viruses will spread like this. So far, there is no case of infection in the world because of contact with patients' tears.