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Role of bird migration in the long-distance dispersal of Ixodes dammini, the vector of Lyme disease.

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Abstract

To evaluate the role of migratory birds in the long-distance dispersal of Ixodes dammini ticks and in the spread of
Lyme disease, a 6-year study of migrating birds to an offshore New England island was conducted during 1989-1994. I. dammini are not endemic on this island, therefore allowing assessment of long-distance tick dispersal rather than local infestation. Of 11,324 spring migrants examined, 1.2% were infested with I. dammini. Of 8607 fall migrants examined, 0.2% were infested. Of nymphal ticks examined, 20% were infected with Borrelia burgdorferi. OspB DNA sequencing of 6 B. burgdorferi isolates was identical to sequences of 2 strains common in coastal Maine. It is evident that bird migration allows for long-distance dispersal of I. dammini from areas where they are endemic to areas where they are not and that a few bird species account for the majority of tick dispersal. The likelihood of establishment of enzootic
Lyme disease by this mechanism is discussed.

J Infect Dis. 1996 Jul;174(1):221-4. Research Support, Non-U.S. Gov’t

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