What is Poison Ivy/Poison Oak?

There are three native American plants that collectively may be called poison ivy: poison ivy, poison oak, & poison sumac. These plants can cause an allergic reaction in nearly 85 percent of the population. To be allergic to poison ivy, you must first be "sensitized" to the oils. This means that next time there is contact with the plant, a rash may occur.

What Causes an Allergic Reaction?

The resin in the plants contains an oily substance called urushiol. Urushiol is easily transferred from the plants to other objects, including toys, garments, tools, and animals. This chemical can remain active for a year or longer. It is important to know that the oils can also be transferred from clothing, pets, and can be present in the smoke from a burning plant.

What are the Symptoms of Poison Ivy/Poison Oak?

The following are the most common symptoms of poison ivy. However, each individual may experience symptoms differently. Symptoms may include:

• a contact dermatitis rash characterized by bumps and blisters that itch
• swelling in the area of contact sometimes occurs
• blisters that eventually break open, ooze, and then crust over

The symptoms of poison ivy may resemble other skin conditions. Always consult your physician for a diagnosis.

Did You Know?
Scratching poison ivy blisters will not spread the rash. In addition, the poison ivy rash is not contagious—only urushiol (oil found in the sap of poison ivy) can cause a reaction.