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Useful Bacteria

Bacteria are important for digestion of food. There are some that fight diseases and those that help make healthful food.
Some examples of good bacteria include:
1. Lactobacillus is used in making yogurt and cheese.
2. Escherichia coli are present in intestines and help in digestion of food, and production of vitamin K.
3. Bacteroides thetaiotaomicron and Bacteroides fragilis live in the gut and help in digestion of carbohydrates and sugar transport and utilization.

Causes and Risk Factors

Some bacteria cause illness. They invade and quickly multiply in the body to form colonies. When this happens in the respiratory tract, the following diseases may occur:
1. Pharyngitis — Streptococcus pyogenes
2. Diphtheria — Corynebacterium diphtheria
3. Pertussis — Bordetella pertussis
4. Tuberculosis — Mycobacterium tuberculosis

Gastrointestinal infections caused by bacteria include:
1. Peptic ulcers — Helicobacter pylori
2. Enteric (typhoid) fever — Salmonella typhi
3. Gastroenteritis — Shigella, Salmonella, and Escherichia coli

Bacteria cause infections of the nervous system such as:
1. Meningitis — Streptococcus pneumonia and Neisseria meningitidis
2. Tetanus — Clostridium tetani
3. Botulism — Clostridium botulinum

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