Bacteria are helpful because they produce oxygen, which our bodies need to breathe, and they help us to digest the food we eat. Bacteria are also helpful because they are used in medicine to help us overcome disease. Bacteria are harmful because they can cause tooth decay and illnesses that can be either common or quite serious.
<span><span>Helpful
bacteria: E. Coli are found in the intestines of humans and aid in
digestion. Streptomyces is used in making antibiotics. Rhizobium are
helpful bacteria found in the soil. They convert nitrogen in the
soil.
Harmful bacteria:. Coli can also
be harmful if food or water is contaminated with it and then
eaten. Listeriosis can cause individuals to become very ill and can even
be potentially deadly. Examples of where it can be found are in
shellfish, cold cuts, and unpasteurized milk. Salmonella is very
dangerous and lives in the intestinal tracts of humans . It is spread
via feces. Foods like poultry and eggs can be contaminated with
salmonella and cause severe diarrhea. The human body contains numerous
types of bacteria that are very beneficial and actually protect us from
the harmful bacteria.</span></span>
