Question

short notes on useful and harmful bacteria




​

Answer 1

The common varieties of bacteria that are useful to humans include various types of antibiotics. ... Harmful bacteria can cause diseases such as cholera, leprosy, tuberculosis and typhoid. Other bacteria produce toxins which cause diseases such as diphtheria, scarlet fever and tetanus.

The only harmful effect of bacteria that you need to concern yourself with, is that they can cause disease and death. Some bacteria such as Escherichia coli (E. coli) actually produce beneficial byproducts for their host, such as vitamin K for humans.