Some Bacteria release toxins (poisons) that travel through the body interfering with the normal activity of the host!
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Some bacteria can cause disease by releasing toxins that harm the body. These toxins can damage cells, tissues, and organs, leading to illness and symptoms of infection. Examples of bacteria that produce harmful toxins include Clostridium botulinum (causing botulism) and Staphylococcus aureus (causing Toxic shock syndrome).
Lactobacillus is a type of bacteria commonly found in the gut and is considered beneficial for digestion. It helps maintain a healthy balance of bacteria in the gut and is also used in the fermentation of foods like yogurt.
Bacilli bacteria can cause a variety of illnesses in humans, including food poisoning, tetanus, tuberculosis, and anthrax. The specific illness caused by bacilli bacteria depends on the species of bacteria and the route of transmission.
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Bacteria can be pathogens, but there are also many other types of pathogens. Bacteria are specific types of single celled organisms. Some bacteria cause disease, some do not. There are also lots of other types of organisms which can cause disease. These include, viruses, fungi, protozoa, yeast. Any organism that can cause disease is called a pathogen. (And yes, there is some debate about whether a virus is an organism. If it is not an organism then it would be classified as a toxin rather than a pathogen.)
Some diseases caused by bacteria include strep throat, tuberculosis, pneumonia, meningitis, and food poisoning. Bacteria can also cause conditions like urinary tract infections, Lyme disease, and leprosy.