Lessons > Counter-Virus > For Your Consideration
As you've seen, diseases travel through populations in fairly predictable ways. Population density, or other factors that have the same effect as changing density, is one of the key features of disease transmission. If you haven't already done so, you should complete the Demographics lab and consider how exponential population growth in certain developing countries might affect disease propagation and how this might be countered.
Diseases like HIV, hepatitis, and avian influenza are currently spreading rapidly in developing countries. On average, the CDC maintains a list of 12 diseases that are epidemic or pandemic and highly lethal. Although the list does not change and a majority of the diseases are found in sub-Saharan Africa, a threat remains constant to the world as a whole. Differences in health care, the availability of clean water (or water in general), and socio-political agendas between first and third world countries often define how quickly disease spreads and to what extent those afflicted may find care and respite. Consider the following: