Folks, I'm on the same train. Here's a comment I found on the web that helps my brain but not my skin. I think the clue might be in the comment that the stuff can get on clothes. I suspect that I've got it on something that and I keep touching that something (a shirt?) and reinfecting myself. But I don't want to wash every article of clothing and sheet in the house!
Can I spread it by Scratching?
"Rhus plants(poison ivy, poison oak, poison sumac) are the most common cause of allergic contact dermatitis in the US. Rhus plans contain the potent antigen urushiol, which will sensitize 60% to 80% of the persons who are exposed to it. ...(It) may be carried on the fur of pets, clothing, shoes, toys, tools, or other objects and then transferred to the skin. Approximately 24 to 36 hrs after a sensitized person is exposed to the urushiol, a blistery, itching rash develops. Usually within 15 minutes of contact, the urushiol binds to skin proteins. If it is washed off with soap and water before that time, a reaction may be prevented. After the antigen is fixed, however, it cannot be washed off or transferred to other areas. Scratching or oozing blister fluid cannot spread the antigen to other areas of the body or to other persons. New lesions that appear a few days after the primary lesions represent less sensitive areas or areas where less antigen was deposited, not spreading of the antigen. Because the course of the reaction usually is 12 to 15 days, 2 weeks of medication should be prescribed. Reference [Dermatology in Primary Care 1994]
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