Full Breakdown
Arapahoe County Resident Recovers from Sin Nombre Hantavirus Infection, Unlinked to Cruise Ship Outbreak
5/26/2026, 9:38:28 PM
Case Confirmation and Current Status
A male Arapahoe County resident tested positive for the Sin Nombre hantavirus variant and is recovering at home, Arapahoe County Public Health said. He had no recent travel and no contact with the cruise ship MV Hondius, which left Argentina on April 1. County officials attribute the infection to recent local rodent exposure, the state's primary transmission route. The announcement was made on Friday.
Hantavirus in Colorado: Seasonal Patterns and Recent Cases
Sin Nombre hantavirus is endemic in Colorado, with most cases occurring in spring and summer when people disturb rodent-infested areas. Deer mice are the primary reservoir, shedding virus in urine, feces, saliva, and nesting material. Only the Andes variant, native to South America, spreads person-to-person; it has not been found in Colorado. A recent cluster on the cruise ship MV Hondius, which departed Argentina on April 1, is unrelated to the Arapahoe case. Earlier this month a Douglas County resident died from the same strain, representing the state's second confirmed case this year.
Public Health Response
Arapahoe County Public Health and CDPHE coordinated the response; officials said the case is unrelated to the MV Hondius outbreak and likely stemmed from rodent exposure. CDPHE advised avoiding contact with rodent droppings, urine, saliva, and nesting material, and listed protective steps. State health officials note that Colorado’s hantavirus risk remains low. Protective steps include wearing goggles, gloves, rubber boots or shoe covers, and an N95 respirator; ventilating the area for at least 30 minutes, applying bleach or disinfectant and soaking for five minutes, then disposing of contaminated material in double-bagged plastic, washing hands thoroughly, and laundering clothing on high heat.
Epidemiological Data
- ?121 hantavirus cases recorded in Colorado from 1993 to 2023 (CDC).
- Second confirmed Sin Nombre case in Colorado in 2024; the Andes variant, which can spread person-to-person, has not been detected in the state.
Public Health Implications
Hantavirus pulmonary syndrome, the severe respiratory illness caused by Sin Nombre infection, can be fatal, yet overall hantavirus infection in Colorado remains rare and does not spread between people. The absence of the Andes variant, which can transmit person-to-person, keeps community transmission risk low, although the recent Douglas County fatality highlights the disease’s potential severity.
Clarifications and Uncertainties
No evidence links the infection to person-to-person transmission or to the cruise ship, and the exact location and timing of rodent exposure remain unspecified.
Future Monitoring and Prevention Guidance
State health officials will continue hantavirus surveillance through the peak season, and residents are urged to follow protective measures and report suspected exposures to local health departments.
