Which pest is known for transmitting diseases to humans?

• A. Mites
• B. Bed bugs
• C. Plaster bagworms
• D. Pigeons

Answer: (D)

Pests that spread disease to people are a major concern in pest management, especially when they contaminate spaces with droppings or bites. Birds that roost on buildings leave droppings that can harbor germs, and these particles can become airborne or contaminate surfaces, leading to infections if inhaled or touched. Pigeons are especially associated with this risk because their droppings accumulate on ledges and around openings, creating conditions where fungi such as histoplasmosis and cryptococcosis can develop, and where bacteria related to psittacosis can be introduced to humans. Because of this, addressing pigeon roosting and properly cleaning contaminated areas are important steps to reduce disease risk.

Mites can cause irritation and allergic reactions and may transmit some conditions in certain contexts, but they are not as broadly recognized as disease vectors in everyday pest control. Bed bugs mainly cause itching and sleep disturbance and do not transmit diseases. Plaster bagworms are nuisance pests that don’t carry human pathogens in a meaningful way.