Can a reaction to poison oak occur two weeks after exposure?

Yes, a reaction to poison oak can occur up to two weeks after exposure. The allergic reaction is caused by urushiol, an oil found in the plant, and symptoms typically develop within 12 to 72 hours after contact. However, in some cases, delayed reactions can happen, especially if the urushiol was transferred to clothing or objects that come into contact with the skin later. It's essential to seek medical advice if you suspect a reaction to poison oak.