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Please use this identifier to cite or link to this item: http://hdl.handle.net/10625/40575

Title: Role of migratory birds in introduction and range expansion of Ixodes scapularis ticks and of Borrelia burgdorferi and Anaplasma phagocytophilum in Canada
Authors: Ogden, Nicholas H.
Lindsay, L. Robbin
Hanincová, K.
Barker, Ian K.
Bigras-Poulin, Michel
Charron, Dominique F.
Heagy, Audrey
Francis, Charles M.
O'Callaghan, Christopher J.
Schwartz, I.
Thompson, R. Alex
Keywords: EPIDEMIOLOGY
DISEASE VECTORS
DISEASE TRANSMISSION
CANADA
Issue Date: Mar-2008
Publisher: American Society for Microbiology, Washington, DC, US
Abstract: During the spring in 2005 and 2006, 39,095 northward-migrating land birds were captured at 12 bird observatories in eastern Canada to investigate the role of migratory birds in northward range expansion of Lyme borreliosis, human granulocytic anaplasmosis, and their tick vector, Ixodes scapularis. The prevalence of birds carrying I. scapularis ticks (mostly nymphs) was 0.35% (95% confidence interval [CI] = 0.30 to 0.42), but a nested study by experienced observers suggested a more realistic infestation prevalence of 2.2% (95% CI = 1.18 to 3.73). The mean infestation intensity was 1.66 per bird. Overall, 15.4% of I. scapularis nymphs (95% CI = 10.7 to 20.9) were PCR positive for Borrelia burgdorferi, but only 8% (95% CI = 3.8 to 15.1) were positive when excluding nymphs collected at Long Point, Ontario, where B. burgdorferi is endemic. A wide range of ospC and rrs-rrl intergenic spacer alleles of B. burgdorferi were identified in infected ticks, including those associated with disseminated Lyme disease and alleles that are rare in the northeastern United States. Overall, 0.4% (95% CI = 0.03 to 0.41) of I. scapularis nymphs were PCR positive for Anaplasma phagocytophilum. We estimate that migratory birds disperse 50 million to 175 million I. scapularis ticks across Canada each spring, implicating migratory birds as possibly significant in I. scapularis range expansion in Canada. However, infrequent larvae and the low infection prevalence in ticks carried by the birds raise questions as to how B. burgdorferi and A. phagocytophilum become endemic in any tick populations established by bird-transported ticks.
URI: http://hdl.handle.net/10625/40575
Document Delivery: To enquire about document delivery, contact the IDRC Library : library@idrc.ca or 613-696-2578 / Pour plus de renseignements sur la livraison de documents, communiquer avec la bibliothèque du CRDI : bibliothèque@crdi.ca ou 613-696-2578
Appears in Collections:IDRC Research Results / Résultats de recherches du CRDI
2000-2009 / Années 2000-2009

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