(a)[2]
Describe how gastric juice in the stomach protects the body against pathogens in food.
(b(i))[1]
Using the information in Fig. 3.1, calculate the percentage of people who catch norovirus by direct contact with an infected person.
(b(ii))[1]
Using Fig. 3.1, calculate how many of the 300 people caught the virus from contaminated water.
(c)[4]
Describe methods of preventing the indirect transmission of norovirus.
(d)[1]
State one body defence that may stop a virus in the air from reaching the lungs.
(e)[3]
Identify the structures labelled A, B and C in Fig. 3.2.