CDC and WHO say not to sweep rodent droppings dry
Both health agencies warn that dry cleaning kicks up particles people can breathe in, and call for wetting the area first.
Sweeping or vacuuming rodent droppings dry sends particles into the air that a person can breathe in, which is why the U.S. Centers for Disease Control and Prevention tells people not to do it. The World Health Organization agrees. Its hantavirus fact sheet calls for avoiding dry cleaning and wetting contaminated areas first.
The reason is how the diseases spread. Rodent-borne illnesses are contracted mostly by breathing contaminated air, and a broom or vacuum throws droplets carrying the virus into the room. The CDC guide puts it bluntly: "Don't vacuum or sweep." The instruction covers urine and nesting material, too.
For cleanup, the agency lays out a wet method. It starts with rubber or plastic gloves, then a bleach solution or a registered disinfectant over the whole area, left for the time the product label specifies. Paper towels do the wiping, a lidded bin takes them, and hands get washed at the end. Anyone who has already swept or vacuumed is told to repeat the same steps.
How serious the risk is
Hantavirus cardiopulmonary syndrome causes "just a few hundred cases a year" in the Americas, the WHO says, but the share of patients who die usually runs from 20% to 40% and sometimes reaches 50%. It is rare and severe. Pest-control workers and animal caretakers face higher exposure, according to the agency's hantavirus prevention page.
None of the three sources is a study, so there is no sample and no comparison group. The CDC cleanup guide dates to April 8, 2024, its prevention page to May 13, 2024, and the WHO fact sheet to May 6, 2026.
The advice applies to the general population in homes, storerooms and garages with rodents. Heavy infestations and workers fall under separate guidance that calls for different protective gear.
