Six strange phenomena of sexually transmitted diseases

　　sexually transmitted diseases (Mainly refers to classic sexually transmitted diseases, excluding some generalized sexually transmitted diseases disease ) There are six "weird things" that we can't explain yet:

　　One strange thing: People have almost no innate immunity to sexually transmitted diseases that is sufficient to prevent infection. skin The mucous membrane is the body's natural defense barrier against diseases. Even if a person comes into contact with countless harmful microorganisms every day, he is rarely infected. Even if the skin is broken, he will recover naturally in three to five days. Most sexually transmitted diseases are infected through the genital mucosa, and the mucous membrane is very sensitive to sexually transmitted diseases.

　　Pathogenic microorganisms have almost no resistance, and once infected, disease is inevitable.

　　Second Monster: Not valid vaccine Meningococci and gonococci belong to the Neisseria genus and have many similar characteristics. However, meningococci vaccines have been available for a long time, and despite efforts, gonococcal vaccines still cannot be used in practice. The application of smallpox vaccine has made smallpox extinct in the world. Measles vaccine, polio vaccine, typhoid vaccine, cholera vaccine, etc. all play an important role in preventing infectious diseases. However, there is no effective vaccine to prevent sexually transmitted diseases so far.

　　Three strange things: Inability to produce strong acquired immunity after illness. Many infectious diseases can obtain post-illness immunity. Some immunity can last for life. If you are exposed to the microorganism again, you will not get sick again. Sexually transmitted diseases, on the other hand, can be re-infected and re-infected.

　　Four strange things: Sexually transmitted diseases cannot be transmitted through insects. Whether blood-borne STDs or STDs transmitted through mucous membranes, they cannot be transmitted through insects. There are many diseases transmitted by insects, such as malaria and Japanese encephalitis. Mosquitoes only need to bite the patient first and then bite the patient. healthy It is possible for people to get sick. However, even blood-borne STDs cannot be transmitted by mosquitoes, and their mechanisms have not yet been elucidated.

　　Five strange things: STD pathogenic microorganisms have low resistance to the outside world. Mycobacterium tuberculosis can survive in a dry environment and maintain its ability to infect for more than 3 months, so it can be transmitted through daily necessities.； After the pus dries, the Grape Cocci can survive for two to three months； Salmonella can remain infectious in feces for a month or two. STD pathogens will die quickly after leaving the human body, thus greatly reducing the risk of indirect infection. For example, Treponema pallidum will die on its own within 1 hour in a dry environment after leaving the human body. ； Neisseria gonorrhoeae has autolysis phenomenon. After leaving the human body, the bacterial cells can dissolve on their own and "suicide". Even if they do not autolyse, they will lose their infectivity within a short period of time. ； scary AIDS The virus also quickly loses its infectivity after leaving the human body.

　　Six strange things: Sexually transmitted diseases can endanger spouses and children. If one person in a couple has a sexually transmitted disease, it will be passed between the two of them like playing table tennis. Unless both parties are cured at the same time, the spread will continue endlessly. Infants and young children stay with their parents who have STDs day and night, and it is difficult to isolate daily necessities, so the possibility of infants and young children being infected is not small. Some sexually transmitted diseases are fetus Infectious diseases such as syphilis and AIDS can be transmitted through the placenta during this period. A fetus infected with Treponema pallidum may have congenital syphilis features on the face at birth, thus telling the world: “My relative has syphilis. ”It really breaks the child's heart.

　　The "Six Big Monsters" of STDs remind people that they must be decisive in preventing STDs and not take chances, resulting in a one-night romance and lifelong regrets. In addition, some people rely on condoms and think they can avoid STDs. In fact, they are not foolproof. The most effective way to prevent STDs is to stay clean.