How many bacteria are there in the human body?

According to a research result at the 19 Russian National Conference on "People and Medicine" held in March 2008, there are 1 to 3 kg of bacteria in human body. There are only 100 bacteria living on human skin, and the number of microorganisms is 10 times of the total number of human cells. Among them, there are both pathogenic bacteria and beneficial bacteria necessary for human survival. People suffer from many diseases because the balance between beneficial bacteria and harmful bacteria is broken. The destruction of this balance becomes the beginning of the inflammatory process, and of course it will also endanger health. Under the influence of harmful bacteria for a long time, the body tissue will change, resulting in chronic diseases. Infectious diseases that cannot be cured in youth may become serious diseases in adulthood. According to the statistical results of scientists, Helicobacter pylori, which can cause chronic inflammation of gastric mucosa, gastritis and ulcer in many cases, lives in the stomachs of about 50% residents on earth. According to the data of the World Health Organization, more than 90% of the people on the earth suffer from periodontal diseases to varying degrees. If these diseases are not treated, it may lead to the destruction of surrounding teeth and supporting tissues. Oral harmful bacteria account for 75% of adult tooth loss, and in many cases it is even suspected that it will lead to other diseases, such as worsening diabetes, or premature delivery after infection in pregnant women. At present, many economically developed countries in the world attach great importance to clinical diagnosis research, because with their help, scientists can identify many harmful bacteria accurately enough and respond quickly to these problems in time to prevent serious diseases. Do you think taking a bath every day will be clean? Don't jump to conclusions There are at least 654.38+0 billion bacteria camping on you, as well as countless fungi, yeasts and tiny bugs. Although there is absolutely no microorganism that can confuse you before birth, it only takes a few hours for them to occupy the newborn's mouth and skin. So, where do bacteria live in the human body? Demodex folliculorum, a bacterium on eyelashes, is a tiny mite with a body length of less than 0.4 mm, which lives in pores and hair follicles and is common at the root of eyelashes. Lipid mites are like bugs with thick short legs. People with oily skin or heavy makeup who are not thoroughly cleaned have the most lipid mites. But most adults have some lipid mites and their eggs. Dental tartar-plaque detection shows that there are hundreds of millions of bacteria in 1 mg dental plaque, and the by-products of bacteria and saliva constitute their hotbeds; In addition, there will be oral amoeba (amoeba) or entamoeba gingivalis (amoeba). These parasites feed on white blood cells and food scraps. People will "run around" when brushing their teeth, and then come out to "make waves" after the danger. These parasites can be found in the mouth of more than 30% people. Candida albicans in the oral cavity also appears in the reproductive organs. There are about 600 kinds of bacteria living in human mouth, and there are more than 65438+ billion bacteria in 1 ml saliva alone. Candida albicans is a fungus that lives in the mouth and can also cause vaginitis in women. Bacteria in the oral cavity usually stick tightly to the mucosal surface, because if they cannot be firmly attached to the oral cavity, they will be washed away when people swallow. Nose Staphylococcus aureus Bacteria in people's nostrils are caught between the nose hairs that filter the air when breathing, and they can climb in from your face. Most of these bacteria are clustered into Staphylococcus aureus like grape clusters. Deep in the nasal cavity, there are a large number of streptococci, which are chain-connected rod-shaped bacteria. Axillary armpit is humid, which is a warm home for microorganisms. The test shows that the number of microorganisms per square centimeter can reach 6.5438+million. There are two most common types, one is Corynebacterium soreum, which is generally believed to cause acne by blocking pores; The other is Staphylococcus epidermidis, which is a common bacteria on the skin and always gathers together. The navel is inhabited by fungi and bacteria, which constitute an interdependent complex ecosystem. The human body temperature is neither cold nor hot, and the unique environment of navel is moist and safe, which is very suitable for fungi to survive. These bacteria will make long silk threads, which will wrap the accumulated human hair and clothing fibers together and provide shelter for fungi and bacteria. Because the groin is close to the urethral orifice, it is normal for some fungi and bacteria to "coexist harmoniously" here. There are always some acid-resistant bacteria and yeasts in the vagina of adult women, which helps to keep the PH value around 4.5, enough to kill many pathogenic bacteria. The occasional crabs and scabies on pubic hair are unhealthy. These parasites can spread through sheets, towels, clothes and other ways without direct contact with the skin, and "immigrate" to others. Dust mites with tiny skin live on your skin and in your home. They feed on dead cells, just like a skin cleaning team. This oval mite has a translucent hard shell, sparse hair, eight furry legs and a big mouth, but no eyes and tentacles. There is a lot of sweat on my feet. There are 250,000 pores on the soles of people's feet, and 60 ml of sweat will flow out every day. This creates a warm and humid environment for the reproduction of bacteria and fungi. The most common foot fungus is the fungus that causes beriberi. They feed on the dead epidermis on their feet. Under your toenails, there will be a kind of skin fungus called Trichophyton, which will harden and change color if it breeds too fast, leading to onychomycosis. People are covered with many kinds of microorganisms, but fortunately, not all microorganisms are harmful, and some microorganisms are necessary for health.