What is the name given to harmful micro-organisms?

How can bacteria, fungi and viruses be spread?

What are the three body defences against infection?

What do white blood cells do to protect against pathogens?

What are antigens?

What are lymphocytes?

What are antibodies?

How do antibodies work?

What is a vaccination?

After an antigen from a pathogen has been encountered, what does the body create for the future?

Why are memory cells important?

What are antibiotics?

How are antibiotics produced?

How have some bacteria become resistant to antibiotics?

How can MRSA be controlled?