Higher Human Biology - Unit 3

Immunity can be developed by vaccination

• True

• False

To make vaccination, what is needed from infectious pathogens, so creating memory cells?

Which of the following is not a type of antigen used in vaccines?

• inactivated pathogen toxins

• dead pathogens

• weakened pathogens

• Healthy pathogens

What are antigens mixed with when making a vaccine?

What substance makes the vaccine more effective, so enhancing the immune response?

What type of immunity occurs when a large percentage of a population is immunised?

During herd immunity, who are protected as there is a lower probability they will come into contact with infected individuals?

The percentage of immune individuals required in a population above which a disease is less likely to spread is called the

What does the herd immunity threshold not depend on?

• price of vaccine

• The type of disease

• The effectiveness of the vaccine

• The density of the population

Some pathogens can change their antigens.

This means that memory cells are not effective against them.

What is this called?