However, in 2008, there was a large contraction in the number of biosurveillance systems. The authors also provide the number of biosurveillance systems per capita. Developed nations have greater biosurveillance coverage per capita than developing nations. The database created in this review includes over 800 documented traditional and syndromic surveillance systems used internationally between 1900 and 2016. Finally, the authors discuss the implications of global biosurveillance in relation to the detection of outbreaks of disease.