Multiple host transfers, but only one successful lineage in a continent-spanning emergent pathogen

Wesley M. Hochachka, André A. Dhondt, Andrew P. Dobson, Dana M. Hawley, David H. Ley, Irby J. Lovette

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Emergence of a new disease in a novel host is thought to be a rare outcome following frequent pathogen transfers between host species. However, few opportunities exist to examine whether disease emergence stems from a single successful pathogen transfer, and whether this successful lineage represents only one of several pathogen transfers between hosts. We examined the successful host transfer and subsequent evolution of the bacterial pathogen Mycoplasma gallisepticum, an emergent pathogen of house finches (Haemorhous (formerly Carpodacus) mexicanus). Our principal goals were to assess whether host transfer has been a repeated event between the original poultry hosts and house finches, whether only a single host transfer was ultimately responsible for the emergence of M. gallisepticum in these finches, and whether the spread of the pathogen from east to west across North America has resulted in spatial structuring in the pathogen. Using a phylogeny of M. gallisepticum based on 107 isolates from domestic poultry, house finches and other songbirds, we infer that the bacterium has repeatedly jumped between these two groups of hosts but with only a single lineage of M. gallisepticum persisting and evolving in house finches; bacterial evolution has produced monophyletic eastern and western North American subclades.

Original languageEnglish (US)
Article number20131068
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1766
StatePublished - Aug 7 2013

All Science Journal Classification (ASJC) codes

  • General Immunology and Microbiology
  • General Environmental Science
  • General Biochemistry, Genetics and Molecular Biology
  • General Agricultural and Biological Sciences


  • Carpodacus
  • Haemorhous mexicanus
  • Host transfer
  • House finch
  • Mycoplasma gallisepticum
  • Phylogeny


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