Parallelisms and contrasts in the diverse ecologies of the Anaplasma phagocytophilum and Borrelia burgdorferi complexes of bacteria in the farwestern United States

Nicole Stephenson, Janet E Foley

Research output: Contribution to journalReview article

3 Citations (Scopus)

Abstract

Anaplasma phagocytophilum and Borrelia burgdorferi are two tick-borne bacteria that cause disease in people and animals. For each of these bacteria, there is a complex of closely related genospecies and/or strains that are genetically distinct and have been shown through both observational and experimental studies to have different host tropisms. In this review we compare the known ecologies of these two bacterial complexes in the far western USA and find remarkable similarities, which will help us understand evolutionary histories and coadaptation among vertebrate host, tick vector, and bacteria. For both complexes, sensu stricto genospecies (those that infect humans) share a similar geographic range, are vectored mainly by ticks in the Ixodes ricinus-complex, utilize mainly white-footed mice (Peromyscus leucopus) as a reservoir in the eastern USA and tree squirrels in the far west, and tend to be generalists, infecting a wider variety of vertebrate host species. Other sensu lato genospecies within each complex are generally more specialized, occurring often in local enzootic cycles within a narrow range of vertebrate hosts and specialized vector species. We suggest that these similar ecologies may have arisen through utilization of a generalist tick species as a vector, resulting in a potentially more virulent generalist pathogen that spills over into humans, vs. utilization of a specialized tick vector on a particular vertebrate host species, promoting microbe specialization. Such tight host-vector-pathogen coupling could also facilitate high enzootic prevalence and the evolution of host immune-tolerance and bacterial avirulence.

Original languageEnglish (US)
Article number26
JournalVeterinary Sciences
Volume3
Issue number4
DOIs
StatePublished - Dec 1 2016

Fingerprint

Anaplasma phagocytophilum
Borrelia burgdorferi
Ticks
Ecology
Vertebrates
Bacteria
ecology
ticks
bacteria
Peromyscus
vertebrates
Peromyscus leucopus
Viral Tropism
Sciuridae
Ixodes
Immune Tolerance
Host Specificity
Observational Studies
tropisms
Ixodes ricinus

Keywords

  • Anaplasma spp.
  • Anaplasmosis
  • Borrelia spp.
  • Borreliosis
  • Diversity
  • Lyme disease
  • Reservoirs
  • Western gray squirrel
  • Woodrat

ASJC Scopus subject areas

  • veterinary(all)

Cite this

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title = "Parallelisms and contrasts in the diverse ecologies of the Anaplasma phagocytophilum and Borrelia burgdorferi complexes of bacteria in the farwestern United States",
abstract = "Anaplasma phagocytophilum and Borrelia burgdorferi are two tick-borne bacteria that cause disease in people and animals. For each of these bacteria, there is a complex of closely related genospecies and/or strains that are genetically distinct and have been shown through both observational and experimental studies to have different host tropisms. In this review we compare the known ecologies of these two bacterial complexes in the far western USA and find remarkable similarities, which will help us understand evolutionary histories and coadaptation among vertebrate host, tick vector, and bacteria. For both complexes, sensu stricto genospecies (those that infect humans) share a similar geographic range, are vectored mainly by ticks in the Ixodes ricinus-complex, utilize mainly white-footed mice (Peromyscus leucopus) as a reservoir in the eastern USA and tree squirrels in the far west, and tend to be generalists, infecting a wider variety of vertebrate host species. Other sensu lato genospecies within each complex are generally more specialized, occurring often in local enzootic cycles within a narrow range of vertebrate hosts and specialized vector species. We suggest that these similar ecologies may have arisen through utilization of a generalist tick species as a vector, resulting in a potentially more virulent generalist pathogen that spills over into humans, vs. utilization of a specialized tick vector on a particular vertebrate host species, promoting microbe specialization. Such tight host-vector-pathogen coupling could also facilitate high enzootic prevalence and the evolution of host immune-tolerance and bacterial avirulence.",
keywords = "Anaplasma spp., Anaplasmosis, Borrelia spp., Borreliosis, Diversity, Lyme disease, Reservoirs, Western gray squirrel, Woodrat",
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T1 - Parallelisms and contrasts in the diverse ecologies of the Anaplasma phagocytophilum and Borrelia burgdorferi complexes of bacteria in the farwestern United States

AU - Stephenson, Nicole

AU - Foley, Janet E

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N2 - Anaplasma phagocytophilum and Borrelia burgdorferi are two tick-borne bacteria that cause disease in people and animals. For each of these bacteria, there is a complex of closely related genospecies and/or strains that are genetically distinct and have been shown through both observational and experimental studies to have different host tropisms. In this review we compare the known ecologies of these two bacterial complexes in the far western USA and find remarkable similarities, which will help us understand evolutionary histories and coadaptation among vertebrate host, tick vector, and bacteria. For both complexes, sensu stricto genospecies (those that infect humans) share a similar geographic range, are vectored mainly by ticks in the Ixodes ricinus-complex, utilize mainly white-footed mice (Peromyscus leucopus) as a reservoir in the eastern USA and tree squirrels in the far west, and tend to be generalists, infecting a wider variety of vertebrate host species. Other sensu lato genospecies within each complex are generally more specialized, occurring often in local enzootic cycles within a narrow range of vertebrate hosts and specialized vector species. We suggest that these similar ecologies may have arisen through utilization of a generalist tick species as a vector, resulting in a potentially more virulent generalist pathogen that spills over into humans, vs. utilization of a specialized tick vector on a particular vertebrate host species, promoting microbe specialization. Such tight host-vector-pathogen coupling could also facilitate high enzootic prevalence and the evolution of host immune-tolerance and bacterial avirulence.

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KW - Reservoirs

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