Cross-reactivity is an important consideration in allergy assessment. When the immune system mounts a response to a protein of similar moiety to a known allergen, adverse reactions may occur. This is especially evident between pollen, fruits and vegetables. Sensitivity to latex for example shows extensive cross-reactivity with certain foods, including banana, avocado and mango which may lead to clinical allergic reactions. Natural rubber latex is a common ingredient found in many products including balloons, appliance cords, hearing aids, swimwear, condoms, rubber bands, and medical and dental s,,upplies such as masks, gloves, syringes, catheters and bandages.