The most prevalent allergens are dust mites and animal dander, affecting up to twenty percent of the American population. Similarly, an estimated twenty-five percent of Americans experience allergy symptoms or sensitivity to household chemicals, for example, cleaning solutions or perfumes.   Following, various food allergies are seen in approximately eleven percent of the population. The most common food allergens are nuts (tree nuts, peanuts), shellfish (shrimp, crab, oysters), eggs, and animal milk, most notably cow's milk. Allergies to grass or pollen, also known as hay fever, affect seven to eight percent of individuals. Approximately the same number of people have allergic reactions to medications. Often, medication allergies are associated with antibiotics, such as penicillin. Ibuprofen allergies are also seen, though they are not as prevalent. Next in line are insect stings and bites, such as bees, wasps, and fire ants. While cockroaches cannot sting and don't usually bite, they are known for spreading many hazardous materials, which can cause allergic reactions similar to dust mites.   Mold, another potentially harmful substance, can also cause allergy symptoms and asthma attacks. Finally, latex allergies are recorded in less than one percent of the American population, though it can be quite the burden. Latex is an ingredient found in many ordinary items, such as balloons, band-aids, and condoms.