Controlling Pandemic Flu: the Value of International Air Travel Restrictions

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2007 May 4

PMID 17476323

Citations 121

Authors

Joshua M Epstein

D Michael Goedecke

Feng Yu

Robert J Morris

Diane K Wagener

Georgiy V Bobashev

Affiliations

Soon will be listed here.

Abstract

Background: Planning for a possible influenza pandemic is an extremely high priority, as social and economic effects of an unmitigated pandemic would be devastating. Mathematical models can be used to explore different scenarios and provide insight into potential costs, benefits, and effectiveness of prevention and control strategies under consideration.

Methods And Findings: A stochastic, equation-based epidemic model is used to study global transmission of pandemic flu, including the effects of travel restrictions and vaccination. Economic costs of intervention are also considered. The distribution of First Passage Times (FPT) to the United States and the numbers of infected persons in metropolitan areas worldwide are studied assuming various times and locations of the initial outbreak. International air travel restrictions alone provide a small delay in FPT to the U.S. When other containment measures are applied at the source in conjunction with travel restrictions, delays could be much longer. If in addition, control measures are instituted worldwide, there is a significant reduction in cases worldwide and specifically in the U.S. However, if travel restrictions are not combined with other measures, local epidemic severity may increase, because restriction-induced delays can push local outbreaks into high epidemic season. The per annum cost to the U.S. economy of international and major domestic air passenger travel restrictions is minimal: on the order of 0.8% of Gross National Product.

Conclusions: International air travel restrictions may provide a small but important delay in the spread of a pandemic, especially if other disease control measures are implemented during the afforded time. However, if other measures are not instituted, delays may worsen regional epidemics by pushing the outbreak into high epidemic season. This important interaction between policy and seasonality is only evident with a global-scale model. Since the benefit of travel restrictions can be substantial while their costs are minimal, dismissal of travel restrictions as an aid in dealing with a global pandemic seems premature.

Citing Articles

Temporal variations in international air travel: implications for modelling the spread of infectious diseases.

Wardle J, Bhatia S, Cori A, Nouvellet P J Travel Med. 2024; 31(4).

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Welfare costs of travel reductions within the United States due to COVID-19.

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Restricting Human Movement During the COVID-19 Pandemic: New Research Avenues in the Study of Mobility, Migration, and Citizenship.

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