According to foreign media reports, “Although we are human, it may be more appropriate to call us bacteria”, this statement sounds like a dystopian statement from a science fiction story, but it is true: millions of bacteria found in the human body can fill a water bottle whose capacity is half a gallon. Every human body is actually a natural playground for a variety of microbes and fungi. Some human bacteria are good for us and some are bad. Some play an essential role, such as helping us digest food; others occasionally mutate and may make us sick. 1, oral bacteria: tartar dense spirochetes All people have these nasty little bacteria in their mouths, but if their reproduction gets out of control due to lack of hygiene, they will cause some serious damage to the gums. They live in the dark, moist environment between the teeth and gums, where they congregate. The dense spirochetes are related to the syphilis spirochetes that can cause syphilis. 2, oral bacteria: Porphyromonas gingivalis Having periodontal disease is not a good thing, and the mouth contains Porphyromonas gingivalis, which is a major bacterium that causes periodontal disease, is also bad for health. Not only can Porphyromonas gingivalis cause inflammation, it can also cause resistance to antibiotics, which is now common. In fact they can crowd out and take the place of bacteria that are good for your teeth. Once Porphyromonas gingivalis gets out of control, it will eventually cause the gums to fall off the teeth. 3, oral bacteria: Veronococcus We can find this genus of parasitic bacteria – Veronococcus – not only in the mouth, but also in the whistle and digestive tract. They are one of the most common of the complex bacterial communities existing in the human body, and although some bacteria such as Veronococcus spp. are associated with disease, most are helpful to us. Scientists believe that Weyrong’s cocci can slow down the formation of tooth decay by turning the acidic products produced by other bacteria into less acidic products. 4. Stomach bacteria: Helicobacter pylori Stomach acid is very strong, so no other bacteria can survive in the stomach except for Helicobacter pylori. Scientists believe that this bacteria has evolved to penetrate and move into the mucus tissue in the stomach. Once inside the stomach, it can cause a variety of gastrointestinal diseases such as gastric ulcers and gastritis. About two-thirds of the world’s population is infected with this bacteria, but they usually do not have any clinical symptoms. 5, intestinal bacteria: bacteria of the genus Bacteroides (Bacteroides fragilis) bacteria accounted for 60% of the dry mass of human feces, no wonder we think intestinal bacteria is very disgusting. But in fact, the visceral biota (including bacteria and fungi) play many active roles in our gastrointestinal tract, sometimes referred to as the “forgotten organ”. They play an important role in the human immune system and help the body break down carbohydrates. But of all the biota in the human body, some intestinal bacteria are good for us and some are bad for us. One of the most common bacteria found in our intestines is Bacteroides fragilis, which help the body produce vitamin K and protect us by fighting disease-causing bacteria. But when it encounters E. coli, it suddenly joins forces with the latter and starts attacking the body, causing infections. 6, intestinal bacteria: Escherichia coli (Escherichia coli) E. coli is one of the most famous intestinal bacteria, because it is one of the most destructive bacteria, but only when it undergoes a special mutation, it can be harmful to the human body. No matter when, we all have E. coli in our bodies, although some variants develop toxic characteristics and suddenly attack their hosts. The genetic factors that separate harmless E. coli from those species that can cause disease in humans are so arcane that they can be seen only at the molecular level. The non-pathogenic E. coli variant Nissle 1917 was so helpful that it was made into a drug as a probiotic, but the toxic strains of E. coli are lethal. Toxic strains can be transmitted to humans through dairy products and cattle that have eaten food contaminated with bacteria-bearing feces. 7, intestinal bacteria: Candida albicans (Candidaalbicans) can be found in almost every healthy individual Candida albicans, they are under the control of a strong immune system. Once they lose control, however, they can wreak havoc on the body. Candida albicans is usually a single-celled bacterium that is stimulated by the environment in which it lives and transforms into a proliferating multicellular bacterium. The environments available for it to survive include the skin, mouth, vagina, rectum and esophagus. Most people know that the disease it causes, candidiasis, is a “cervical infection”. This disease can not only cause itching in the affected area, but also in the body of some immune-suppressed individuals like HIV-infected individuals, the bacteria can enter the bloodstream and cause serious infections to the heart and other vital organs. 8, skin bacteria: Malassezia spp. Another yeast – Malassezia spp. can cause itchy scalp. Spherical Malassezia (M. globosa) and restricted Malassezia (M. restricta) live in the oiliest areas of the body, and they can cause dandruff and seborrheic dermatitis. Tens of millions of Malassezia sphericalis may live on each human head. Other types of Malassezia spp., such as thick-skinned Malassezia (M. pachydermatis), are more commonly found on the skin of animals, but they can be transmitted to humans through their best friend, the pet dog. 9, skin bacteria: Staphylococcus spp. Many people are alarmed to hear the term “staphylococcus”, especially with the recent outbreak of deadly drug-resistant staphylococci. Staphylococcus aureus is a variant that often causes threatening health problems and is often transmitted through food poisoning or through skin contact with the wounds of infected people. Another type of Staphylococcus genus, Staphylococcus epidermidis, is more prevalent and they accumulate on our skin. Staphylococcus epidermidis is typically a harmless bacterium, but it can invade the body at any time through medical devices or foreign substances such as catheters, pacemakers and breast implants, causing blood, eye and urinary tract infections. 10, skin bacteria: Propionibacterium acnes (P. acnes) People once thought that chocolate and French fries caused acne, but in fact this skin problem is caused by a variety of factors such as hormones, dead skin, oil and bacteria (i.e. Propionibacterium acnes). While no one is sure what causes acne to become infected through the sebaceous glands, we are clear that Propionibacterium acnes bacteria live on the fatty acids in our pores and when the pores are clogged, they grow like crazy and bacteria such as staphylococcus stick to the skin through the pus that comes out, causing damage to the skin tissue. Many natural antimicrobials such as benzoyl peroxide and clove oil can be used to kill Propionibacterium acnes, but tetracycline will not work because Propionibacterium acnes has developed resistance to it.