B1

Bacteria

• Bacteria are living cells
• When in our body the multiply rapidly
• Then release toxins/poisons.
• This makes us ill.
• Diseases caused by bacteria- Salmonella, cough, cholera, typhoid.

Viruses

• Smaller than bacteria and consists of a fragment of  material inside a protective coat of protien.
• Viruses only reproduce in host cells.
• A virus enters a cekk and  multiplys inside until the host cell blows up.
• The viruses then passed out into the blood stream.
• Diseases caused by virueses- Influenza, colds, measles, mups, rubella, AIDS.