what are germs

What are germs?
- Bacteria, fungi, virus are microbes.
- Some microbes are useful for making bread, cheese, wine.
- Germs: are the microbes that cause disease.
- Not all diseases are caused by microbes.


* Bacteria
- Bacteria are cells that are big enough to be seen under a light microscope.
- Bacteria are found everywhere: - in the air, in the food, in the water, inside living organisms.
- Some are useful and others are harmful that cause diseases such as pneumonia, tuberculosis, scarlet fever.
- Bacterial cell: has a cell wall, cell membrane, a loop of DNA.

Cell Wall
Cell Membrane
Loop of DNA



*Bacterial growth:
- Bacteria can be grown in sterile conditions in the laboratory.
- A colony of bacteria starts with just 1 cell.
- It divides into 2 cells, then the 2 divide into 4, then the 4 divide in to 8, then the 8 divi...