After urushiol cell protein bonding is the key concept I believe. I believe the statement is true based on the following reasons listed here and here. I also have had poison ivy a few times and have not spread it. I like to think I have an open mind so I accept your premise. I understood your statement to be that you have spread it to your wife after bonding. Is that correct?

BTW, my wife claimed I gave it to her also. I now think it was because of improper cleaning that caused this. Thanks for your feedback!

PS. I do not fully understand the systemic case yet where it spreads internally.