Bacteria are single-celled organisms that originated early in Earth's history and can be found virtually anywhere, including in our homes, bodies, food, environment, and air. While some bacteria can cause food spoilage and disease, many bacteria play important roles like aiding digestion, preventing other pathogens from overgrowing, degrading pollutants, and assisting industries like food production and pharmaceutical research. It is important to understand bacteria can have both benefits and risks, and steps should be taken to prevent the spread of disease-causing bacteria.

1. Bacteria
Friends or foes?

2. What are Bacteria?
• Bacteria are primitive, single-
celled life forms that originated
very early in the history of life
on Earth.

3. How bacteria look like?

6. Where do bacteria live?
Bacteria are all around us. They
can survive in our homes and in
the environment. They are found
in water, land and in air.

7. How do bacteria help us?

8. Bacteria in Human Health
• Normal bacteria found in the intestine, female
genital tract and oral cavity help prevent
overgrowth of potential pathogens in humans
and aid in digestion.

9. Bacteria in Food Industry

10. Bacteria in the Environment
• Used to degrade oil spill
• Used to remove toxic materials from the
environment
• Decomposers

11. Bacteria in Pharmaceutical and
Research

12. What are the Negative impacts
of Bacteria?

13. Food spoilage

14. Bacterial disease and other
sickness

15. Can I Prevent Bacterial Disease?