Spiders get shipped sometimes out of their geographical range...like Black Widows showing up in New York. But check out this link...the text in bold quotation marks is from the article.We also have what's called a brown recluse spider....nasty bite. Can kill a small child. On average one bite will cause a fist sized ball of flesh to desolve.
I was reading that the wolf spiders venom has no antidote and can stay in your system for years, continuing to Digest your living flesh.
http://dermatology.cdlib.org/DOJvol5num ... cluse.html
"Two other spiders that have the potential to produce necrotizing wounds, though much less well-documented than the brown recluse, are the hobo spider and the yellow sac spider. The hobo spider (Tegenaria agrestis) may be found in the Pacific Northwest as far east as Montana and south into Oregon and Utah. The two yellow sac species (Cheiracanthium spp.) are found all over the United States, but probably only produce minor necrotic wounds."
You are well out of range of where Brown Recluses live. You could get some by shipping or cars traveling. What is happening...the Hobo spider which is our nickname for the Funnel-web in the US, is causing bites with symthoms identical to the Brown Recluse. I've read that the range of Hobo spiders is all the way into Canada now. Maybe the Brown Recluse is farther North too? But both cause a wound and infection, skin all around turns yellow, rots away. My Mom had that also. Catching the spider is the only way to know which one it was. Or maybe they are territorial...on our property you find hundrens of Funnel-webs but no Brown Recluses. I have never found even one Brown Recluse spider in my town.