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How do bacteria harm the human body?
Transcript of How do bacteria harm the human body?
What harm does bacteria do to the human body?
Bacteria are everywhere: in soil, in water, in air, and in the bodies of every person and animal. These microorganisms are among the most numerous forms of life on Earth.
Most bacteria are either harmless, or helpful, or even essential to life. In the human body, bacteria help keep the digestive tract working properly.
how they are helpful
Bacteria can cause hundreds of illnesses. Some bacterial infections are common (like colds) , Others cause major diseases.
Bacterial infections can be common in childhood, such as strep throat and ear infections.
They also can cause major diseases, such as tuberculosis, plague, syphilis, and cholera.
What they can cause
where are bacteria
How they can be spread
through the air
contact with animals
contact with infected people
from a part of body where it is harmless, and moved to a part where it can do damage.
How they "do" the damage
Bacteria can cause illness in several ways. Some destroy tissue directly. Some become so numerous that the body cannot work normally. And some produce toxins (poisons) that kill cells.