Up to 60% of people with asthma who live in urban environments also have a sensitivity to the allergens of what pest?

• A. Cockroach
• B. Dust mites
• C. Pollen
• D. Mold

Answer: (A)

In urban asthma, indoor pest allergens play a major role in triggering symptoms, and cockroach allergens are especially important. Up to about 60% of people with asthma living in cities show sensitivity to cockroach allergens, making this the most strongly associated pest-based trigger in urban settings. Cockroach allergens come from the insects’ feces, saliva, and body parts, and they accumulate in dust and on surfaces the more infestations are present. When people who are sensitized inhale these particles, it provokes airway inflammation and can worsen wheeze and attacks.

While dust mites, pollen, and mold are all notable allergens, they aren’t pests in the same sense as cockroaches. Dust mites are tiny creatures found in bedding and fabrics, pollen comes from outdoor plants, and mold grows in damp indoor environments. The question specifically points to a pest, and cockroach exposure has the strongest documented link to urban asthma outcomes.