The Most Common Allergy In The World

Urushiol is a molecule found in poison ivy and poison oak that causes allergic reactions in humans. Although not inherently dangerous, it tricks the immune system into responding as if it were a threat. This reaction is similar to other allergies, where harmless substances trigger an immune response. Urushiol is the most common allergy, affecting 85% of people, yet it doesn't seem to have evolved as a defense mechanism. The reason why urushiol affects humans and not other animals remains a mystery.

What is urushiol and what role does it play in allergic reactions?

Explain how urushiol can trick the immune system into reacting.

Discuss the significance of the biological handcuffs in the immune response to urushiol.

Why is urushiol considered the most common allergy in the world?

What are some theories about why urushiol affects humans but not other animals?