Bacteria refers to a broad domain of prokaryotic microorganisms (microscopic organisms without a membrane-bound nucleus). They are very abundant in nature. According to Christian Nordqvist (2009), for example, one gram of soil can contain up to forty million bacterial cells. Bacterial microorganisms are found almost everywhere and adapt very well to the surrounding conditions. Not all bacteria are harmful and play an important role in nutrient recycling. By recycling nutrients, bacteria become a precious resource for the human body. Large colonies of bacteria called probiotics are contained in our large intestine, where they are responsible for producing the vitamins our body needs to survive. Although most bacteria in the body are valuable and harmless, there is another type of bacteria that has the opposite role. These microbes are called pathogenic bacteria. Pathogenic bacteria are the type of bacteria responsible for infections and diseases. They invade a host, reproduce, and cause damage to the infected host. According to the Washington State Department of Health, tuberculosis is one of the most common fatal diseases caused by pathogenic bacteria. It is mainly treated with a course of strong antibiotics to fight the infection. Antibiotics inhibit the growth of bacteria and are used to treat infections. They affect not only pathogenic bacteria but also probiotics. Other common ways that bacteria are neutralized are the use of disinfectants, high heat, and ultraviolet irradiation. When bacteria no longer respond to neutralization methods, they are said to be resistant. In modern times, bacterial organisms have become resistant to antibiotic treatments. It's not like there's only or... half the paper... the density has led to a large amount of bacterial infections. This is due to a lack of sanitation, waste management and access to clean water. Another driving factor is that antibiotics are unregulated and anyone with enough money can access them. The overuse of these drugs has led to the discovery of bacteria resistant to some of the most powerful antibiotics in medical science. Fortunately, this resistance is currently only found in harmless bacteria that live in approximately two hundred million citizens. This does not end the concern. Biologists fear that harmless bacteria could transfer genes to more deadly pathogenic bacteria. Events following a genetic transfer under the right conditions could be catastrophic. Imagine a fatal disease with no known medical cure in one of the most densely populated areas. It could only end badly.