The spread of type 2 porcine reproductive and respiratory syndrome virus (prrsv) in North America: A phylogeographic approach

Mang Shi, Philippe Lemey, Manreetpal Singh Brar, Marc A. Suchard, Michael P. Murtaugh, Susy Carman, Sylvie D'Allaire, Benjamin Delisle, Marie Ève Lambert, Carl A. Gagnon, Li Ge, Yihan Qu, Dongwan Yoo, Edward C. Holmes, Frederick Chi-Ching Leung

Research output: Contribution to journalArticlepeer-review

Abstract

The emergence and spread of Type 2 Porcine Reproductive and Respiratory Syndrome virus (Type 2 PRRSV) in North America is heavily influenced by the multiple site production system used in the hog industry. However, it is unclear how anthropogenic factors such has this have shaped the current spatial distribution of PRRSV genotypes. We employed Bayesian phylogeographic analyses of 7040 ORF5 sequences to reveal the recent geographical spread of Type 2 PRRSV in North America. The directions and intensities in our inferred virus traffic network closely mirror the hog transportation. Most notably, we reveal multiple viral introductions from Canada into the United States causing a major shift in virus genetic composition in the Midwest USA that went unnoticed by the regular surveillance and field epidemiological studies. Overall, these findings provide important insights into the dynamics of Type 2 PRRSV evolution and spread that will facilitate programs for control and prevention.

Original languageEnglish (US)
Pages (from-to)146-154
Number of pages9
JournalVirology
Volume447
Issue number1-2
DOIs
StatePublished - Dec 2013

Keywords

  • Evolution
  • Molecular epidemiology
  • PRRSV
  • Phylogeography
  • Recombination

ASJC Scopus subject areas

  • Virology

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