Chapter 8 - Depth of Understanding

Before people wishing to donate blood can do so, they must answer several questions. One of these questions asks whether they have lived in the UK for longer than three months between 1980 and 1996 or more than 5 years in Europe between 1980 and the present. What is the purpose of these questions?

What is the relationship between socio-economic conditions and emerging infectious diseases?

Three influenza pandemics have occurred in the United States since 1918. Were they connected to one another in any way, and if so, how?