Hantavirus Map USA 2026
The United States accounts for the majority of Hantavirus Pulmonary Syndrome (HPS) cases in the Americas. The primary threat is Sin Nombre virus, carried by the deer mouse (Peromyscus maniculatus), and risk is concentrated in western states where these rodents are most abundant. Cases peak between May and October, when people are more likely to disturb rodent-infested spaces.
USA signal summary
Reviewed public signals with USA-linked context
1
Confirmed
0
Monitoring
6
Total signals
Why the Western US?
The deer mouse (Peromyscus maniculatus) is the primary reservoir for Sin Nombre virus in North America. Its range covers much of the western and central United States, from the Pacific coast to the Great Plains. States like Colorado, New Mexico, Arizona, and California consistently report the highest case counts because their climate and terrain — forests, grasslands, and foothills — support large deer mouse populations.
Outbreaks often follow environmental shifts. Heavy rainfall from El Niño events can trigger rodent population booms, increasing the odds of human exposure. The 1993 Four Corners outbreak, which first identified Sin Nombre virus, followed an unusually wet spring that drove deer mouse populations to 10–15 times their normal density.
Most human infections occur when people breathe in aerosolized virus from rodent droppings, urine, or saliva — typically while cleaning out cabins, opening seasonal sheds, or camping in rodent-infested shelters. The fatality rate for HPS in the US remains around 36%, making early recognition critical.
How to Read USA Map Signals
The USA map view separates confirmed records, monitoring signals, and source mentions. Diagnosis location and exposure location may differ — always check the source link for full context.
Case records
Red dots indicate confirmed, source-linked cases. Open markers for details.
Monitoring signals
Yellow dots identify locations being watched for context, not confirmed diagnoses.
Source mentions
Some markers reflect public references. Check the source link before interpreting.
State-Level Context
Below is a breakdown of reviewed signals by state. Counts reflect public signals in our tracker, not official CDC case totals. For official data, visit the CDC hantavirus surveillance page.
California
California is one of the states most affected by hantavirus in the US. The 2012 Yosemite outbreak — which sickened ten people and killed three — traced back to deer mouse infestations in the park's signature tent cabins. Risk is highest in the Sierra Nevada foothills and mountain communities where deer mice nest in seasonal structures. Most California cases occur between May and October, when cabin owners and campers are most likely to disturb rodent-contaminated spaces.
No reviewed signals currently in this view. This does not mean zero risk — hantavirus exposure can occur year-round. Check the live map for the latest context, and follow CDC guidance for your state.
Colorado
Colorado sits at the center of the US hantavirus belt. It was part of the 1993 Four Corners outbreak that first identified Sin Nombre virus in the Americas. The state consistently reports some of the highest case counts nationally, with risk concentrated in rural and foothill areas where deer mice nest in cabins, sheds, and campgrounds. Most cases occur between May and October when people are more likely to be cleaning seasonal properties or camping.
Chelan County, United States
1/1/2026 · Confirmed · NewsRadio 560 KPQ
Nebraska
Nebraska's hantavirus risk comes from its agricultural landscape. Deer mice thrive in and around grain storage, barns, and farm outbuildings — especially during harvest season when rodents seek shelter indoors. The state's first confirmed HPS case was reported in the late 1990s, and periodic cases have appeared since, typically in rural counties during spring and summer months.
Nebraska, United States
5/10/2026 · Inconclusive · Wikipedia/ECDC/WHO
Geneva, USA
1/1/2026 · Suspected · 13wham.com
New York City, United States
1/1/2026 · Source Mention · nyp.org
Other US states
Additional states with reviewed signals in our tracker. Other high-risk states include New Mexico, Arizona, and Washington — all within the deer mouse's range. Not all states with hantavirus risk may have active signals at any given time.
Hopewell, United States
1/1/2026 · Suspected · rochesterfirst.com
Unknown, United States
1/1/2026 · Suspected · whec.com
Prevention & Symptoms
Understanding hantavirus symptoms and prevention strategies is critical if you live in or travel to affected areas. These guides are for informational purposes and do not replace medical advice.
USA Hantavirus Map FAQ
Medical & Data Disclaimer
This page is for public awareness only. HantavirusMap.life is not an official CDC case registry or US government database.
Map points may represent public source mentions, not confirmed case totals. Signal counts on this page reflect reviewed entries in this tracker only.
Users should consult health professionals for symptoms or exposure concerns and follow local public health authority guidance, including CDC and state health department recommendations.