Human Mobility Networks, Travel Restrictions, and the Global Spreadof 2009 H1N1 Pandemic

摘要

After the emergence of the H1N1 influenza in 2009, some countries responded with travel-related controls during the early stage of the outbreak in an attempt to contain or slow down its international spread. These controls along with self-imposed travel limitations contributed to a decline of about 40% in international air traffic to/from Mexico following the international alert. However, no containment was achieved by such restrictions and the virus was able to reach pandemic proportions in a short time. When gauging the value and efficacy of mobility and travel restrictions it is crucial to rely on epidemic models that integrate the wide range of features characterizing human mobility and the many options available to public health organizations for responding to a pandemic. Here we present a comprehensive computational and theoretical study of the role of travel restrictions in halting and delaying pandemics by using a model that explicitly integrates air travel and short-range mobility data with high-resolution demographic data across the world and that is validated by the accumulation of data from the 2009 H1N1 pandemic. We explore alternative scenarios for the 2009 H1N1 pandemic by assessing the potential impact of mobility restrictions that vary with respect to their magnitude and theirposition in the pandemic timeline. We provide a quantitative discussion of thedelay obtained by different mobility restrictions and the likelihood ofcontaining outbreaks of infectious diseases at their source, confirming thelimited value and feasibility of international travel restrictions. Theseresults are rationalized in the theoretical framework characterizing theinvasion dynamics of the epidemics at the metapopulation level.