Which household organisms are known to cause allergic reactions in homes?

• A. Cockroaches
• B. Spiders
• C. House dust mites
• D. Mosquitoes

Answer: (C)

Allergens in homes often come from tiny organisms living in dust, especially house dust mites. These mites are microscopic and their bodies and feces contain proteins that can trigger allergic reactions and asthma when inhaled. They thrive in warm, humid spots like bedding, upholstery, and carpets, so exposure is continuous year-round. Because their presence is so common and their allergenic proteins are potent, dust mites are the best-known indoor allergen source. Other listed organisms can contribute to allergies, but they aren’t as consistently linked to indoor allergic symptoms as dust mites. To reduce exposure, wash bedding weekly in hot water, use mite-proof covers on pillows and mattresses, keep humidity lower, and vacuum with a HEPA-filtered vacuum.