What bacteria have you encountered in your life?

Disease-causing bacteria are bacteria that cause disease. For example: staphylococci, streptococci, plague bacillus, etc.
Soil bacteria – increase soil fertility by decomposing inorganic substances.
Lactic acid bacteria – used to create fermented milk products: kefir, fermented baked milk, cheese, cottage cheese, etc.
Lactobacillus – fight against pathogenic bacteria.
Decay bacteria – cause decay processes, can be observed when food is spoiled.
Bifidobacteria are involved in the synthesis of vitamin C in the human body.