OHSU seeks spider bite info.


Tuesday, September 11, 2007 | 2 comment(s)

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Researchers at the Oregon Poison Center at Oregon Health & Science University hope to better understand spider bites in the Northwest.

They are trying to determine which spiders bite, which cause skin loss (ulcers) — and whether the much-maligned hobo spider causes either, according to a press release.

Evidence directly linking spider bites to ulceration or infection is thin, so say OHSU researchers. People often find red marks on their skin and attribute them to spider bites.

The Northwest native hobo spider has been implicated as a source of ulcers and skin infections for many years. Its venom has been demonstrated to cause tissue death when injected into the skin of animals, but there is debate about whether the spider ever bites or is even capable of biting humans.

“There isn’t a single documented case of actually seeing a hobo spider bite a human that resulted in ulceration,” said Dr. Rob Hendrickson, the study’s principal investigator.

Hobo spiders have been presumed to be the only spider in the Northwest capable of causing ulceration. Presumptions, however, aren’t factual science.

The Oregon Poison Center is helping in the project, asking all Oregonians who actually see a spider bite them to call (800) 222-1222. Poison center staff will offer medical advice as usual and then make follow-up calls during the next several weeks to check for signs of ulceration and infection. The caller also will be sent a postage-paid package in which to send the spider to the poison center.

“We understand not everyone will feel comfortable killing the spider, and we won’t pressure them to do so, but we would still like to hear about the spider bite,” said OHSU’s  Nathanael McKeown.
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michele johnson djnmjohnson@comcast.net wrote on Sep 21, 2007 12:29 AM:

My daughter missed the first month of school last year due to a spider bite, doctors like to tell me it wasnt, that MRSA patients commonly present with what "appears" to be a spider bite, but doctors typically dismiss that and say it is just a point of entry at which someone introduced the resistant staph and develope a nasty abcess or infection.We actually saw the two holes from the bite and caught the spider upon moving her matress that was directly on the floor, I KNOW the wound first was a bite, that then developed into a nasty case of MRSA. I still have it to this day in a jar, I took it to her doctors, and I called the zoo, ohsu and wrote the lab at Linfield(my home town college)hoping to have it tested for possibly carrying MRSA. The bite abcessed and tested positive for MRSA(resistant staph)there have been several cases of this in my clean middle class neighbor hood, on either side of my residence even. All occuring around the same time of year, coincidentally through my research, and statistically if you review the cdc tracking of ca("community acquired")mrsa the rates are higher in the late summer/ early fall months, which coincides with the mating time for many of our common spiders in the area. Durring this time they will be out in the open and more aggressive. I am pleased to see OHSU taking an interest in spiders and skin ulcerations, but I also would like someone to test to see if it is possible for them to carry in them or on them the resistant staph. If a mosquito can spread malaria, west nile, disentary, why is it not totally plausible that spiders could have a direct effect on the dramatic rise in Community Acquired Methacylin Resistant Staphlococaus Aurus.

DEBBIE LOGHRY wrote on Sep 12, 2007 8:09 AM:

MY DAUGHTER WAS IN 8TH GRADE AND HAD A HORRENDUS BITE(we thought it was a bite)IT WAS VERY PAINFUL AND WAS ON HER THIGH FOR SEVERAL WEEKS-FORTUNATELY IT FINALLY DISAPPEARED BUT LEFT A SCAR-SHE IS NOW 31 SO I AM UNSURE IF THE SCAR IS STILL VISIBLE-WE EVEN TOOK HER TO HER PEDETRICIAN AND HE WASN'T QUITE SURE WHAT IT WAS.

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