| Ixodes ricinus | The castor bean tick, a Euroasian species that infests cattle, sheep, and wild animals, and transmits the virus of louping ill, the piroplasm Babesia divergens, the central European tick-borne encephalitis virus, and the Lyme disease bacterium. (05 Mar 2000) |
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| Ixodes spinipalpis | A species parasitic on wild rodents in British Columbia and the vector of Powassan virus in mice of the genus Peromyscus. (05 Mar 2000) |