AIDS necessary conditions

AIDS is a very serious disease and is highly contagious. AIDS itself is very harmful, and it has also created a group of people who are AIDS-phobic, which is a psychological disease caused by fear of AIDS. We must have a correct understanding of AIDS and know the necessary conditions for contracting AIDS. Don't always be suspicious and scare yourself. Good methods can help you stay away from AIDS.

All the conditions for HIV infection are

Infection source + infection route + infection amount + susceptible population

To be infected with HIV, four conditions must be met:

1. Out: The patient releases the virus outside the body.

2. To be alive: that is, the released virus must be infectious.

3. Quantity: The number of viruses reaches a certain level.

4. Entry: The released viruses can enter the body.

1. There is a result. The virus must be discharged from the infected person or AIDS patient through blood, semen, vaginal secretions, breast milk, wound exudate, etc. The prerequisite for the spread of AIDS is that an HIV-infected person excretes enough virus from his or her body to infect another person. The blood, semen, clear fluid discharged from the penis of an infected person before ejaculation, and vaginal and cervical secretions of a woman may all carry relatively high levels of the virus, and the risk of infection is relatively high if you come into contact with these fluids. There is little or no virus in saliva, urine and tears, and sweat, vomit, etc. do not contain the virus, so HIV will not be transmitted through daily contact.

2. To live. The HIV virus must be alive to be transmitted. The HIV virus can only survive in the human body, and mainly exists in blood, semen and vaginal fluid. It will die soon after leaving the human body. The temperature and humidity of the environment will affect the spread of HIV. For example, high temperature and dryness will kill HIV within a few minutes. Although current scientific research has not been able to quantitatively analyze the survival time of HIV under different environmental conditions, it is certain that its survival ability in the external environment is very fragile, especially in a dry environment, where its survival ability is even lower than that of the hepatitis B virus. The probability of survival in the environment of saliva and tears is very small.

3. There is quantity. HIV needs to reach a certain number to spread. Although HIV can be detected in saliva, the amount is very small and not enough to be transmitted. Pathogens will only take effect when they reach a certain number. When the number does not reach a certain scale, the human body's immunity can take effect and kill them. The virus content in five body fluids, including blood, semen, vaginal secretions, breast milk, and wound exudate, is very high, enough to cause infection; HIV is also present in urine, tears, sweat, and saliva, but the concentration is extremely low and it is difficult to cause transmission.

4. There is entry. A large number of viruses must be discharged from the body of an infected person in conditions where they can survive. In addition, a sufficient number of viruses must enter the body of a healthy person through a certain means in order to spread and infect the human body. The virus must have the right conditions to enter the bloodstream. The HIV virus must pass through broken skin and mucous membranes to enter another person's blood. This is because intact skin or mucous membranes are natural barriers. Only if they are damaged can the HIV virus invade the body. That is, a normal person's skin or mucous membranes must have fresh breaks. Intact skin and mucous membranes can prevent HIV from entering the human body. The excreted virus can be transmitted from one person to another in certain ways. Sexual intercourse, blood transfusion and sharing of unsterile injection needles can transmit the excreted virus to another person. The virus in the mother's body can be passed to the fetus or baby during pregnancy, delivery or breastfeeding. A sufficient amount of the virus can enter the body through the damaged skin and mucous membranes of the contact person. The HIV virus can enter the body through damaged areas of the vagina, rectal mucosa, oral mucosa, ulcers or breaks in the skin, or through needles containing the virus or transfusion of blood containing the virus.