What are the positive and negative values of bacteria?

positive qualities of bacteria:
1. bacteria-symbionts. there are bacteria in the human body – without them such important processes as digestion, assimilation of food, synthesis of useful minerals, etc., cannot proceed.
2. bacteria are used in the preparation of various starter cultures, kefir, yogurt.
3. Bacteria reduce the risk of harmful viruses entering the body. after a course of taking antibiotics, the bacteria die, which is why the body has dysbiosis, which is accompanied by weakness, nausea and diarrhea.
4. bacteria – saprotrophs are involved in the decomposition of dead organisms, create fertile soil.
negative qualities of bacteria:
1. various kinds of diseases are transmitted by airborne droplets, as well as with unwashed vegetables and fruits, dirty water. in this case, bacteria act as carriers of dangerous diseases such as whooping cough, plague, anthrax, etc.
2. there are bacteria that cause food to rot. after taking such food, poisoning occurs, and if you do not consult a doctor in time, then a person may die from infection. for example, this phenomenon can be found in canned food, the disease is called botulism.