There are several reasons why a completely risk-free environment is difficult to achieve in epidemiology. First, pathogen evolution can lead to new strains that are resistant to existing treatments or vaccines. Second, global mobility facilitates the rapid spread of diseases across borders. Third, environmental factors such as climate change can influence the distribution of disease vectors like mosquitoes. Additionally, socio-economic factors may limit access to healthcare and preventive measures, further complicating the eradication efforts.
