What type of bacteria is commonly found in the environment and typically harmless?

Coliform bacteria are a group of microorganisms commonly found in the environment, especially in soil, vegetation, and the intestines of warm-blooded animals. While some types of coliform bacteria can indicate the presence of pathogens or fecal contamination, the majority of coliforms are not harmful to human health. They serve as an important indicator in water quality testing, as their presence suggests that the water could be contaminated by more harmful bacteria or pathogens.

This characteristic makes coliform bacteria particularly significant in environmental monitoring and public health. Their relatively harmless nature in environmental contexts contrasts with more pathogenic bacteria, such as Escherichia coli (certain strains), Salmonella, and Staphylococcus aureus, which are often associated with foodborne illnesses and infections.