Country profile
Hantavirus in Japan
No active risk signals detected for Japan in the current 30-day window.
Hantavirus signals for Japan are aggregated from WHO Disease Outbreak News, ProMED-mail, PAHO bulletins, and global news (GDELT & Google News). The risk index combines news mention density, verified outbreak reports, source authority, and recency. Hantaviruses are considered endemic in this country.
Confirmed cases · HFRS
2023Annual range
0–5/year
Cumulative
—
not centrally reported
Case-fatality rate
1%
Syndrome
HFRS
hemorrhagic fever with renal syndrome
Seoul virus in port cities. Human cases rare in recent decades; surveillance is laboratory-based.
Source National Institute of Infectious Diseases (Japan)Recent news from Japan
No recent country-tagged news. See the global feed for context.
FAQ
Hantavirus in Japan: questions answered
How many hantavirus cases per year are reported in Japan?
Japan reports approximately 0–5/year confirmed hantavirus cases, based on National Institute of Infectious Diseases (Japan) surveillance through 2023. The reported case-fatality rate is approximately 1%. The dominant strain is Seoul virus causing hemorrhagic fever with renal syndrome (HFRS). Seoul virus in port cities. Human cases rare in recent decades; surveillance is laboratory-based. See National Institute of Infectious Diseases (Japan) for the authoritative current figure.
Is hantavirus present in Japan?
Yes — Japan is a known reporting region for hantavirus. The principal strain associated with human cases is Seoul virus, primarily carried by brown rats. Local transmission produces hemorrhagic fever with renal syndrome (HFRS). Japan currently shows a low Hantavirus Tracker risk index, meaning no notable signals have been detected from monitored sources in the recent window.
What is the current hantavirus risk in Japan?
No active risk signals are being detected for Japan in the current window. This means the Hantavirus Tracker has not seen meaningful news, outbreak reports, or surveillance updates for the country in the last 30 days.
How does hantavirus spread in Japan?
Most human infections in Japan occur when people inhale aerosolized particles from rodent urine, droppings, or saliva, typically while cleaning enclosed spaces such as cabins, sheds, barns, or rural homes that have had rodent activity. Less commonly, infection follows a rodent bite or eating food contaminated by rodents. Person-to-person spread is generally not documented for hantaviruses globally, with the notable exception of Andes virus in southern South America, which has produced confirmed person-to-person clusters in Argentina and Chile.
What are the symptoms of hantavirus and when should someone in Japan seek care?
Early symptoms appear roughly one to eight weeks after exposure and include fever, severe muscle aches (especially in the thighs, hips, lower back), headache, nausea, vomiting, and abdominal pain. After several days, HFRS patients develop low blood pressure, hemorrhage, and acute kidney injury that may require dialysis. Anyone with flu-like symptoms and recent rodent exposure (within the last six weeks) should contact a healthcare provider immediately and explicitly mention the rodent contact history.
How is hantavirus prevented in Japan?
Prevention focuses on reducing contact with rodents and their droppings: seal openings ¼ inch and larger in homes and outbuildings, store food in rodent-proof containers, remove brush and woodpiles near dwellings, and clean rodent-contaminated areas safely. Never sweep or vacuum dry droppings — that aerosolizes the virus. Instead, ventilate the space, wear gloves and an N95 respirator, spray surfaces with a 1:10 bleach-water solution, let it soak five minutes, then wipe with paper towels and double-bag the waste. People working in rural agriculture, hantavirus-endemic forests, or cleaning long-unused cabins in Japan are at the highest occupational risk.
Free digest
Get alerted if Japan escalates
Free email when the Japan risk index moves to high or severe. No card required.
We don't sell your email. Unsubscribe anytime.
Prevention
- Seal openings ¼ inch and larger in homes and outbuildings.
- Trap rodents and remove sources of food and shelter.
- When cleaning rodent-contaminated areas, wet down with a 1:10 bleach-water solution before wiping; never sweep or vacuum dry droppings.
- Wear gloves and an N95 respirator when cleaning enclosed rodent-affected spaces.
See the full prevention guide →
Other countries to watch
Reference
Read more: What is hantavirus · Symptoms · Transmission · Historical outbreaks