Does poison ivy have thorns4/1/2024 But lots of other plants have leaves of three, as shown below. Poison ivy leaves are comprised of three individual leaflets, never more. "LEAVES OF THREE, LET IT BE." That little rhyme can certainly get you started in the identification process. So it's best to avoid ANY exposure, regardless of how tough you think you are. Repeated exposure often results in higher levels of sensitivity. A person's level of sensitivity can increase over time. That variable, along with the amount and duration of exposure, can cause a broad range of reactions. Some people have greater degrees of sensitivity than others. People who react when exposed to urushiol have been sensitized to it. The result is a form of contact dermatitis caused by allergic reaction. When the poisonous sap (urushiol) binds to skin cells, our body's T-cells initiate an immune response. Little does he realize that those rashes caused by poison ivy are in fact a type of immune response. THE TOUGH GUY: Do you know one of those guys who brags about his "immunity to poison ivy"? It's as though his immune system is so robust that it fights off all those poison ivy toxins, leaving him rash free and full of machismo. Video: Poison Ivy -Identify-Prevent-Remove Want to safely keep your property poison ivy free? This video will show you how. POISON IVY: How to Identify, Prevent & Remove
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