Year Model years requiring a test. 2014 1990, 1992, 1994, 1997, 1999, 2001, 2003, 2005, 2007. 2015 1991, 1993, 1995, 1996, 1998, 2000, 2002, 2004, 2006, 2008. 2016 1992, 1994, 1997, 1999, 2001, 2003, 2005, 2007.
An important pest of livestock and horses throughout the western United States. In California, this tick is frequently found in the warm, dry regions of the central valley down to the southern portion of the state. Rarely, these ticks have been found on humans, dogs, cats, and sheep.
In Japan, the vector tick is found in the mountainous area of the northern part of the mainland Honshu and Hokkaido. In Hokkaido, it is found even in flatlands. Actually in Japan, the Lyme disease cases have been reported from these areas since it was first confirmed in 1986 (see p. 218 of this issue). The carrier rate of the tick is geographically variable and is in the range of 6.7-22%.