Protect Yourself From Hantavirus

Montana Department of Public Health and Human Services confirmed a case of Hantavirus Pulmonary Syndrome (HPS) in a Cascade County resident. This case is one of 34 HPS cases reported in Montant since 1993. Montana typically sees 1 to 2 cases a year with this being the second in 2012. Cascade City-County Health Department (CCHD) wants to remind residents that there are steps they can take to protect themselves against infection from Hantavirus.

“Many people are eager to begin spring cleaning of the garages, sheds, barns or decide to┬ámake that first trip of the season to the cabin,” said Alicia M. Thompson, Health Officer. “It is important that people know what steps they can take to protect themselves against Hantavirus.”

Hantavirus cases often increase as people begin to clean their garages and sheds in warmer spring weather. Cleaning activities can disturb nesting materials contaminated with dried saliva, urine or droppings from infected deer mice. The disturbed nesting materials become airborne and the air is inhaled causing an exposure to the virus. This exposure leads to a Hantavirus infection. A person might also be infected with Hantavirus if contaminated materials are directly introduced into broken skin or into the eyes or mouth.

Symptoms can begin one to six weeks after becoming infected with the virus. The illness typically starts with 3-5 days of “flu-like” symptoms including fever, sore muscles, headaches, nausea, vomiting and fatigue. Within a few days the illness rapidly progresses to severe shortness of breath.

Early diagnosis of Hantavirus and immediate medical care increase the likelihood of a full recovery. Individuals exposed to rodents or their waste who experience symptoms should immediately seek medical treatment and notify their provider that they have been around rodents or rodent wastes. Providing this information to your provider will help him or her to look closely for any rodent-carried disease, such as Hantavirus.

The best way to prevent Hantavirus transmission is by controlling rodent populations in areas where you live and work.

  • Seal up cracks and gaps in buildings that are larger than 1/4 inch, including window and door sills, under sinks around the pipes, in foundations, attics and any rodent entry hole.
  • Trap indoor rats and mice with snap traps, and remove rodent food sources.
  • Keep food (including pet food) in rodent-proof containers.

If you find places where rodents have nested, or if you find rodent droppings or waste, follow these steps to help prevent exposure to Hantavirus while cleaning:

  • Wear rubber or plastic gloves
  • Thoroughly spray/soak area with a disinfectant or mixture of bleach and water to reduce dry dusty conditions in the area being cleaned (visit or call 454-6950 and ask for a Public Health Nurse for specific mixing instructions)
  • Wipe or mop the area with a sponge or paper towel (throw away these items after use)
  • Wash hands thoroughly with soap and warm water after removing gloves
  • Never sweep or vacuum in these areas as this can stir up dust and aerosolize the droppings

More information on Hantavirus and its prevention can be found by downloading this printable fact sheet or by calling 454-6950 and asking to speak with a Public Health Nurse.