From the thesis abstract: "There are four significant variables that must be considered when assessing the biosecurity threat of infectious disease to the US. Climate change, globalization, bioterrorism and policy all have a variance of impact that must be considered to prevent an outbreak of disease. Diseases such as Ebola, Zika, anthrax, and measles, have all had recent impact on the biosecurity of the US. Climate change is having an effect upon the habitat of many arthropod vectors of disease. Global travel and human migration are increasing the ranges of many infectious diseases of global significance. After the attacks of September 11th, 2001, the US has increased efforts to identify and combat bioterrorism. Health policies that address vaccinations have come under scrutiny. When diseases are assessed against the four variables, the vulnerability of public health prevention and response efforts can be assessed and identified as 'gaps.' Once identified, gaps in biosecurity can be mitigated to prevent or lessen the impact of future outbreaks of infectious disease."
Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/