There are millions of bacteria on your skin and inside your mouth, nose, and lungs.
A great many live in your intestines.
Other kinds of bacteria live in the air, in water, or in the top layers of soil.
Bacteria, whether harmful or beneficial, can be spherical, rod-shaped, or spiral.
Each of these harmful bacteria causes a serious illness or disease.
Spherical bacteria
pneumonia
Boils blood poisoning
Sore throat
Scarlet fever
Rod-shaped bacteria
Tuberculosis
Tetanus
Typhoid fever
Spiral bacterium
Cholera
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