A limited survey was conducted in 2003 to determine if Ochlerotatus japonicus was spreading outside of King County, Washington. Ochlerotatus japonicus was found in north-central Pierce County and west-central Snohomish County. These collections represent county records. An additional site was reported from King County. Ochlerotatus japonicus is established and spreading to other areas of Washington.
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Sames et al. (2005) studied this question.
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