AS 3.1 AS Unit 1: 3.1.4 Microorganisms use us for food, shelter and their reproduction

Viruses
Candidates should be able to explain:

• the development of the symptoms of AIDS
• how HIV is spread, and how it may be controlled
• why antibiotics are ineffective against viruses

Immunity and vaccines
When provided with suitable data, candidates should be able to evaluate evidence relating to the risks and benefits of mass vaccination programmes.