1. Increased human intrusion into tropical
forests
2. Changes in human behaviors
3. Population growth and changes in demographics
4. Population shifts within and between countries
5. Inadequacy and deterioration of public health
infrastructures worldwide
6. Erosion of expertise on diseases
7. Misuse of anitbiotics or other anitmicrobial drugs
8. Ecological changes due to irrigation projects or
deforestation
9. Increased trade
10. Long and short term changes in weather and climate