Delaying the international spread of pandemic influenza


Cooper, BS; Pitman, RJ; Edmunds, WJ; Gay, NJ; (2006) Delaying the international spread of pandemic influenza. PLoS medicine, 3 (6). e212. ISSN 1549-1277 DOI: 10.1371/journal.pmed.0030212

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Abstract

BACKGROUND: The recent emergence of hypervirulent subtypes of avian influenza has underlined the potentially devastating effects of pandemic influenza. Were such a virus to acquire the ability to spread efficiently between humans, control would almost certainly be hampered by limited vaccine supplies unless global spread could be substantially delayed. Moreover, the large increases that have occurred in international air travel might be expected to lead to more rapid global dissemination than in previous pandemics. METHODS AND FINDINGS: To evaluate the potential of local control measures and travel restrictions to impede global dissemination, we developed stochastic models of the international spread of influenza based on extensions of coupled epidemic transmission models. These models have been shown to be capable of accurately forecasting local and global spread of epidemic and pandemic influenza. We show that under most scenarios restrictions on air travel are likely to be of surprisingly little value in delaying epidemics, unless almost all travel ceases very soon after epidemics are detected. CONCLUSIONS: Interventions to reduce local transmission of influenza are likely to be more effective at reducing the rate of global spread and less vulnerable to implementation delays than air travel restrictions. Nevertheless, under the most plausible scenarios, achievable delays are small compared with the time needed to accumulate substantial vaccine stocks.

Item Type: Article
Keywords: Disease Outbreaks/*prevention & control, Health Planning Guidelines, Humans, Influenza A Virus, H5N1 Subtype/*immunology/pathogenicity, *Influenza Vaccines, Influenza, Human/epidemiology/*prevention & control/transmission, International Cooperation, Models, Theoretical, Stochastic Processes, Time Factors, Travel, *Vaccination, World Health, Disease Outbreaks, prevention & control, Health Planning Guidelines, Humans, Influenza A Virus, H5N1 Subtype, immunology, pathogenicity, Influenza Vaccines, Influenza, Human, epidemiology, prevention & control, transmission, International Cooperation, Models, Theoretical, Stochastic Processes, Time Factors, Travel, Vaccination, World Health
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Research Centre: Vaccine Centre
PubMed ID: 16640458
Web of Science ID: 239479600026
URI: http://researchonline.lshtm.ac.uk/id/eprint/6816

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