Do mice carry hantavirus?

Short answer: yes, some mice carry hantavirus, and the deer mouse — common across rural Iowa — is the primary carrier in the Midwest. Here's what you actually need to know.

Hantavirus Pulmonary Syndrome (HPS) is rare in the United States — fewer than 1,000 confirmed cases since the CDC started tracking in 1993 — but the mortality rate is high (around 38%). The risk in Iowa is low but not zero, and it comes from one species in particular.

Which Iowa mice carry hantavirus

• Deer mouse (Peromyscus maniculatus) — the primary carrier. Common in rural Iowa, barns, sheds, cabins, and outbuildings. White belly, large ears, two-toned tail.
• White-footed mouse — also a known carrier in the Midwest. Looks similar to the deer mouse.
• House mouse (Mus musculus) — the gray mouse you see in city homes. Not a significant hantavirus carrier.

How people get exposed

Hantavirus is spread through aerosolized particles from mouse urine, droppings, and nesting material. The classic exposure is sweeping out a barn, garage, cabin, or shed that's been closed up for a while — the act of sweeping puts virus particles into the air, where they can be inhaled. You cannot get hantavirus from a mouse bite alone in any meaningful number of cases.

How to clean up safely

• Do NOT sweep or vacuum dry droppings. That aerosolizes the virus.
• Ventilate the space for at least 30 minutes before entering.
• Wear gloves and an N95 (or better) mask.
• Spray droppings, nesting material, and dead mice with a 1:10 bleach-and-water solution. Let sit 5 minutes.
• Wipe up with paper towels and double-bag for disposal.
• Disinfect the area again after cleanup. Wash hands thoroughly.

Prevention is the real answer

Sealing entry points (mice fit through a gap the size of a dime), removing nesting material, and setting a permanent baiting/trapping program around outbuildings is the only long-term solution. We service a lot of acreages and farms across Southeast Iowa specifically for this — keeping deer mice out of the barn, shop, and house.