Animal droppings are more than a smell. They can carry illness, and the dust is the biggest risk.

What they can carry

Bat and bird droppings can grow a fungus that causes histoplasmosis. Deer mice can carry hantavirus. Rats can spread leptospirosis and salmonella, and raccoon droppings may hold roundworm eggs.

How people get sick

Most illnesses come from breathing dust or touching droppings and then your mouth. Dry sweeping makes dust airborne, which is the worst thing to do.

How to clean safely

Wet the area with disinfectant, wear gloves and a respirator and use a HEPA vacuum. For attics or large amounts, hire a professional.