# HantaTracker — Full content for LLMs

License: CC-BY 4.0 for data, MIT for code.
Last updated: 2026-05-10T22:00:00Z
Canonical site: https://hantatracker.net/
Source-fidelity aggregator. Every figure links to a Tier-1 official source (WHO, CDC, ECDC, or PAHO).

## Global aggregate (current)

| Field | Value |
| --- | --- |
| Reporting period | 2026 cruise-ship cluster (Andes virus, multi-country) — onset 6–28 April 2026 |
| Confirmed cases | 6 |
| Suspected cases | 2 |
| Deaths | 3 |
| Countries reporting | 9 |
| Active outbreaks | 1 |
| Last updated (UTC) | 2026-05-10T22:00:00Z |

## Cases by country (current)

Confirmed and suspected are distinct fields and are never summed. Country rows carry only Tier-1 figures whose reporting period extends into Q3 2025 or later.

| ISO3 | Country | Confirmed | Suspected | Deaths | Active outbreak | Confidence | Reporting period | Primary source |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |


## Recent Tier-1 publications

### 2026-05-08 — Risk Assessment

[WHO DON 2026-DON600: Hantavirus cluster linked to cruise ship travel, Multi-country (update)](https://www.who.int/emergencies/disease-outbreak-news/item/2026-DON600) (WHO, 2026-05-08)

WHO updated the cruise-ship cluster figures: "a total of eight cases, including three deaths (case fatality ratio 38%)". Six cases laboratory-confirmed as hantavirus, two probable. Four patients currently hospitalised, one in intensive care in Johannesburg. Affected countries expanded to nine: Argentina, Cabo Verde, Chile, Germany, Netherlands, South Africa, Spain, Switzerland, United Kingdom. All confirmed cases identified as Andes virus (Orthohantavirus andesense). H2H transmission documented among close contacts aboard the vessel. WHO assesses the risk as low at the global level and moderate at the cruise-ship level.

### 2026-05-07 — Risk Assessment

[WHO's response to hantavirus cases linked to a cruise ship](https://www.who.int/news/item/07-05-2026-who-s-response-to-hantavirus-cases-linked-to-a-cruise-ship) (WHO, 2026-05-07)

WHO updated figures for the cruise-ship cluster: 8 cases, 5 confirmed as hantavirus (Andes virus), 3 deaths. Director-General Dr Tedros stated WHO assesses the public-health risk as low because Andes virus only transmits between people via close, prolonged contact. WHO deployed an onboard expert, shipped 2,500 diagnostic kits from Argentina to five countries, and developed disembarkation guidance under the IHR.

### 2026-05-06 — General Update

[WHO Hantavirus Fact Sheet](https://www.who.int/news-room/fact-sheets/detail/hantavirus) (WHO, 2026-05-06)

WHO updated its Hantavirus Fact Sheet. Incubation period given as 1–8 weeks. Human-to-human transmission documented only for Andes virus in the Americas. Case fatality 20–40% commonly (up to 50%) for HCPS; <1–15% for HFRS. No licensed antiviral or vaccine.

### 2026-05-04 — Risk Assessment

[WHO DON 2026-DON599: Hantavirus cluster linked to cruise ship travel, Multi-country](https://www.who.int/emergencies/disease-outbreak-news/item/2026-DON599) (WHO, 2026-05-04)

WHO reported a hantavirus cluster on a cruise ship that departed Argentina on 1 April 2026: 2 confirmed and 5 suspected cases, 3 deaths. Affected countries: Argentina, Cabo Verde, Netherlands, Spain, South Africa, United Kingdom. Andes virus suspected. WHO assessed global risk as low.

### 2025-12-19 — Risk Assessment

[PAHO Epidemiological Alert: HPS in the Americas Region (19 December 2025)](https://www.paho.org/sites/default/files/2025-12/2025-12-19-epidemiological-alert-hantavirus-engfinal_0.pdf) (PAHO, 2025-12-19)

PAHO/WHO issued an Epidemiological Alert for Hantavirus Pulmonary Syndrome in the Americas. Eight countries reported 229 confirmed cases and 59 deaths through EW 47 of 2025; regional case fatality rate 25.7%. Argentina and Chile accounted for the Andes-virus subset (101 confirmed, 28 deaths). Listed here as historical Tier-1 reporting; not included in current site totals — HantaTracker now displays only the 2026 cruise-ship cluster, the only documented Andes-virus event with H2H transmission. See METHODOLOGY.md §Scope.


## Methodology

# Methodology

This document describes how HantaTracker decides what to publish, how to label confidence, and how to issue corrections. It is the source of truth: the published methodology page mirrors this file byte-for-byte.

## Scope — current Andes-virus risk events only

HantaTracker tracks **active Andes-virus (Orthohantavirus andesense) risk events**. Andes virus is the only hantavirus species with documented person-to-person transmission, and is therefore the only orthohantavirus that carries cluster / multi-country outbreak risk distinct from rodent-spillover incidence. Other hantaviruses — Sin Nombre virus (North America), Choclo virus (Panama), Puumala / Dobrava-Belgrade (Europe), Seoul virus (global), Laguna Negra (Bolivia/Paraguay literature) and others — cause significant human disease but are rodent-borne only and do not propagate between people. They are out of scope for this site.

Displayed totals (`cases_global.json`, `kpis.json`) cover only **the currently-active Andes-virus event** — at present, the 2026 cruise-ship cluster reported in WHO DON 600 (multi-country, Andes virus, H2H transmission documented aboard the vessel, onset 6–28 April 2026). Pre-cluster Andes-virus surveillance (e.g. PAHO's 2025 Americas alert reporting 66 confirmed in Argentina and 35 in Chile through EW 47) is preserved as historical context in the news feed (`feed.json`) but is no longer included in the displayed counts. Country rows (`cases_by_country.json`) are currently empty: the WHO DON does not attribute cluster cases to specific destination countries, so per-country rows would have to be inferred. Per-country rows will appear when a Tier-1 source publishes a country-attributed Andes-virus figure.

This scope was adopted on 2026-05-10. The first reduction (drop non-Andes country rows) and the second (drop pre-cluster Andes counts) are both logged in `CORRECTIONS.md`.

## Source prioritization

HantaTracker only publishes figures that can be linked to a Tier-1 official source. Tier-1 always overrides Tier-2.

**Tier 1 (required):**

- World Health Organization (WHO) — Disease Outbreak News, Hantavirus Fact Sheet
- U.S. Centers for Disease Control and Prevention (CDC) — Hantavirus surveillance, NNDSS, WONDER
- European Centre for Disease Prevention and Control (ECDC) — Hantavirus surveillance, Atlas
- Pan American Health Organization (PAHO) — Epidemiological alerts and updates

**Tier 2 (reference and cross-check):**

- National health ministries (Argentina, Brazil, Chile, Panama, Paraguay, Uruguay, Canada; Belgium, Finland, France, Germany, Hungary, Norway, Russia, Slovenia, Sweden and other European MOHs; China NHC, Japan NIID, Hong Kong CHP, South Korea KDCA, Taiwan CDC; Africa CDC, South Africa NICD)
- China CDC Weekly
- CDC Open Data Catalog and APIs (CDC WONDER, CDC Stacks)

`SOURCES.md` is the canonical user-facing list of every Tier-1 and Tier-2 source. Per-source fetch and update mechanics — URL patterns, query templates, cadence, parser notes — live in the internal `INGESTION.md` playbook.

When two Tier-1 sources disagree, we publish the most recent and link both. When a newer Tier-1 source revises an earlier Tier-1 figure (for example, the WHO 7 May 2026 news item that revised the cruise-ship cluster from "2 confirmed, 5 suspected" to "5 confirmed, 3 suspected"), we update the value, change the source citation, and log the revision in `CHANGELOG.md` and `DATASOURCES.md`. A Tier-2 figure may be quoted only after it can be cross-checked against a Tier-1 figure covering the same reporting period. We never publish a figure derived from an unofficial source, social media, or our own modelling.

## Confirmed vs suspected cases

We follow the case definitions used by the publishing authority, taken verbatim where possible. Confirmed and suspected cases are stored in distinct fields in our data files and are never summed in any visualisation. Confirmed cases drive the choropleth fill on the world map; suspected cases appear only in the country detail panel.

## Country-row reporting period

A row in `cases_by_country.json` must carry a Tier-1 figure whose reporting period extends into **Q3 2025 (calendar week 27, ≥ 1 July 2025) or later**. Older Tier-1 figures (e.g. the Canadian NDSS 2023 count) remain in `DATASOURCES.md` as historical context but do not appear as country rows.

This rule keeps the country choropleth aligned with what is currently being reported by Tier-1 surveillance, rather than blending fresh outbreaks with multi-year-old aggregates.

## Confidence labels

Every country entry carries one of three labels:

- **High** — figures published by WHO, CDC, ECDC, or PAHO within the last 14 days.
- **Medium** — figures published by a national health ministry within the last 30 days.
- **Low** — figures older than 30 days, or from a single source.

The label refers to the freshness and provenance of the figure, not to the trustworthiness of the underlying authority. Most country rows currently carry the Low label because the most recent Tier-1 regional alert (PAHO, 19 December 2025) is more than 30 days old.

## R₀ and other modelled values

We do not publish modelled values such as R₀ unless they are quoted from a Tier-1 source. The KPI card displays "Not established" when no source is available. We do not infer.

## Update cadence

We aim to:

- Review Tier-1 sources every 24 hours.
- Publish updates within 48 hours of source publication.

Failing a stated cadence is worse than not stating one. If we cannot meet this cadence, we will revise this document rather than quietly drift.

## Correction policy

If a published figure is later found to be incorrect, we:

1. Update the figure in the relevant `data/*.json` file.
2. Add an entry to `CORRECTIONS.md` describing what changed, when, and why.
3. Add a feed item with the tag `Correction` linking to the corrected source.

Historical snapshots in `/snapshots/YYYY-MM-DD/` are never edited after the day they are written. They preserve the record of what was published at the time.

## Editorial workflow

Two-person review is required before publishing any of:

- The first case in a new country.
- Any death.
- Any claim of human-to-human transmission.
- Any R₀ figure.
- Any vaccine or treatment claim.
- Any WHO risk-level change.
- Any correction affecting historical figures.

Single-person review is sufficient for routine case-count updates from existing Tier-1 sources, and for adding a feed item that quotes a Tier-1 source verbatim. Each published change is logged in `CHANGELOG.md`.

## Medical disclaimer

HantaTracker is not medical advice and not a surveillance system. The site is a faithful aggregator of publicly available reports. For clinical guidance, contact your local public-health authority.

## Sources

# Sources

This document lists every official source HantaTracker draws from. The machine-readable equivalent is `data/sources.json`.

## Tier 1 — In active use on the site

Every numeric value displayed on HantaTracker — every KPI, every country row, every feed item — links to one of the sources below. The build will fail if a value cites anything else (`scripts/verify.mjs` enforces the host allowlist). When two Tier-1 sources disagree we publish the most recent and link both; when a newer Tier-1 source revises an earlier one (as the WHO 7 May 2026 news item did for the cruise-ship cluster) we update the value and log the change.

### World Health Organization

- [Disease Outbreak News (DONs)](https://www.who.int/emergencies/disease-outbreak-news) — global outbreak alerts and risk assessments.
- [Hantavirus Fact Sheet](https://www.who.int/news-room/fact-sheets/detail/hantavirus) — baseline medical facts: transmission, incubation, vaccine status, case fatality.
- [WHO DON 2026-DON599: Hantavirus cluster linked to cruise ship travel, Multi-country](https://www.who.int/emergencies/disease-outbreak-news/item/2026-DON599) — May 2026 cruise-ship cluster.
- [WHO's response to hantavirus cases linked to a cruise ship (7 May 2026)](https://www.who.int/news/item/07-05-2026-who-s-response-to-hantavirus-cases-linked-to-a-cruise-ship) — revised cluster figures (8 cases, 5 confirmed, 3 deaths) and IHR response detail.

### U.S. Centers for Disease Control and Prevention

- [Hantavirus Reported Cases](https://www.cdc.gov/hantavirus/data-research/cases/index.html) — cumulative U.S. case counts.
- [National Notifiable Diseases Surveillance System (NNDSS)](https://www.cdc.gov/nndss/infectious-disease/index.html) — weekly U.S. notifiable disease tables.
- [CDC WONDER NNDSS](https://wonder.cdc.gov/nndss.html) — structured queries against NNDSS.

### European Centre for Disease Prevention and Control

- [Hantavirus Surveillance and Disease Data](https://www.ecdc.europa.eu/en/hantavirus-infection/surveillance-and-disease-data) — EU/EEA surveillance landing page.
- [ECDC Annual Epidemiological Report 2023 — Hantavirus Infection](https://www.ecdc.europa.eu/en/publications-data/hantavirus-infection-annual-epidemiological-report-2023) — most recent annual report.
- [ECDC Surveillance Atlas of Infectious Diseases](https://atlas.ecdc.europa.eu/public/) — downloadable EU/EEA data.

### Pan American Health Organization

- [Epidemiological Alerts and Updates](https://www.paho.org/en/epidemiological-alerts-and-updates) — Americas regional alerts.
- [PAHO Epidemiological Alert: Hantavirus Pulmonary Syndrome in the Americas Region (19 December 2025)](https://www.paho.org/sites/default/files/2025-12/2025-12-19-epidemiological-alert-hantavirus-engfinal_0.pdf) — current per-country baseline for the Americas.

## Tier 2 — Catalogued, not currently displayed

**No value on the site is sourced from Tier 2.** The list below is a catalogue of national health ministries, regional surveillance bodies, and adjunct CDC data products that we *intend* to integrate as the update mechanism matures. They are useful for filling country-level gaps that Tier-1 does not carry (e.g. the bulk of European Puumala cases, China's HFRS counts, weekly bulletins from MINSAL Chile or MINSA Panama), and for tracking faster-cadence reports ahead of slower Tier-1 annual aggregates.

A Tier-2 figure becomes eligible for display only after it can be cross-checked against a Tier-1 source covering the same reporting period. Country rows in `cases_by_country.json` must in addition carry a Tier-1 figure whose reporting period extends into Q3 2025 (≥ 1 July 2025) or later — see `METHODOLOGY.md`.

Per-source fetch and update mechanics — URL patterns, query templates, parser notes — are documented in the internal `INGESTION.md` playbook (not rendered on the site).

### CDC and other US references

- [CDC Open Data Catalog](https://data.cdc.gov/)
- [CDC Open Technology APIs](https://open.cdc.gov/apis.html)
- [CDC WONDER API](https://wonder.cdc.gov/wonder/help/wonder-api.html)
- [CDC Stacks](https://stacks.cdc.gov/)

### Asia

- [China CDC Weekly — Hantavirus surveillance](https://weekly.chinacdc.cn/en/article/doi/10.46234/ccdcw2025.141)
- [China — Monthly statutory infectious disease report (NHC)](https://www.nhc.gov.cn/wjw/yqbb/list.shtml)
- [South Korea — KDCA Notifiable Infectious Disease Surveillance](https://npt.kdca.go.kr/)
- [Taiwan — NIDSS Hantavirus Syndrome](https://nidss.cdc.gov.tw/en/nndss/disease?id=HANTA)
- [Hong Kong — Hantavirus infection (Centre for Health Protection)](https://www.chp.gov.hk/en/healthtopics/content/24/3057.html)
- [Japan — IASR / NESID notifiable disease surveillance (NIID)](https://www.niid.go.jp/niid/en/iasr-e.html)

### Americas (national)

- [Argentina — Boletín Epidemiológico Nacional](https://www.argentina.gob.ar/salud/epidemiologia/boletines)
- [Chile — Boletín Epidemiológico de Hantavirus (MINSAL)](https://epi.minsal.cl/hantavirus-materiales-relacionados/)
- [Brazil — Hantavirose (Ministério da Saúde / SVS)](https://www.gov.br/saude/pt-br/assuntos/saude-de-a-a-z/h/hantavirose)
- [Panama — Boletín Epidemiológico Semanal (MINSA)](https://www.minsa.gob.pa/informacion-salud/boletin-epidemiologico-semanal)
- [Paraguay — Dirección General de Vigilancia de la Salud (MSPBS)](https://www.mspbs.gov.py/dgvs/)
- [Uruguay — Ministerio de Salud Pública](https://www.gub.uy/ministerio-salud-publica/)
- [Canada — Hantavirus (Public Health Agency of Canada)](https://www.canada.ca/en/public-health/services/diseases/hantavirus.html)

### Europe (national)

- [Finland — Tartuntatautirekisteri / Sampo (THL)](https://sampo.thl.fi/pivot/prod/en/ttr/shp/fact_shp)
- [Sweden — Sorkfeber statistics (Folkhälsomyndigheten)](https://www.folkhalsomyndigheten.se/folkhalsorapportering-statistik/statistik-a-o/sjukdomsstatistik/sorkfeber/)
- [Germany — SurvStat@RKI 2.0](https://survstat.rki.de/)
- [France — Odissé open data (Santé publique France)](https://odisse.santepubliquefrance.fr/)
- [Norway — MSIS Statistics Bank (FHI)](https://statistikk.fhi.no/msis)
- [Belgium — Hantavirus infection numbers (Sciensano)](https://www.sciensano.be/en/health-topics/hantavirus-infection/numbers)
- [Netherlands — Hantavirusinfectie (RIVM)](https://www.rivm.nl/hantavirusinfectie)
- [Austria — Hantavirus annual case table (AGES)](https://www.ages.at/mensch/krankheit/krankheitserreger-von-a-bis-z/hantavirus)
- [Czechia — Hantaviry (SZÚ)](https://szu.gov.cz/tema/prevence/hantaviry)
- [Slovakia — EPIS infectious disease portal (ÚVZ SR)](https://www.epis.sk/InformacnaCast.aspx)
- [Slovenia — Tedensko spremljanje HMRS (NIJZ)](https://nijz.si/communicable-diseases/tedensko-spremljanje-hemoragicne-mrzlice-z-renalnim-sindromom-hmrs/)
- [Estonia — Communicable disease bulletins (Terviseamet)](https://www.terviseamet.ee/en/communicable-diseases/statistics/communicable-disease-bulletins)
- [Hungary — Weekly epidemiological report (NNGYK)](https://www.nnk.gov.hu/)
- [Romania — Hantavirus communiqué (INSP / CNSCBT)](https://insp.gov.ro/)
- [Serbia — Hantavirus communications (Institut Batut)](https://www.batut.org.rs/)
- [United Kingdom — UKHSA notifiable diseases](https://www.gov.uk/guidance/notifiable-diseases-and-how-to-report-them)
- [Russia — HFRS surveillance (Rospotrebnadzor)](https://www.rospotrebnadzor.ru/)

### Africa

- [Africa CDC — Epidemic Intelligence Weekly Report](https://africacdc.org/disease-events/)
- [South Africa — Hantavirus Pulmonary Syndrome (NICD)](https://www.nicd.ac.za/diseases-a-z-index/hantavirus-pulmonary-syndrome/)

## Corrections

# Corrections

This file logs corrections to previously published figures. Per [methodology](./METHODOLOGY.md), each correction lists what changed, when, why, and links to the corrected source.

Historical snapshots in `/snapshots/YYYY-MM-DD/` are never edited after the day they are written. They preserve the record of what was published at the time.

## Format

Each entry follows this format:

> **YYYY-MM-DD** — *Field changed* — Brief description. ([source](https://example.org))

## Log

> **2026-05-10** — *Editorial scope (refinement)* — HantaTracker narrowed further from "Andes virus only" to "currently-active Andes-virus risk events only". Pre-cluster Andes-virus surveillance counts (Argentina 66 confirmed / 21 deaths and Chile 35 / 7, both from PAHO 19 December 2025, EW 1–47) retired from displayed totals. Globals revised: confirmed 107 → 6, suspected unchanged at 2, deaths 31 → 3, countriesReporting unchanged at 9 (still the 9 cluster countries), activeOutbreaks unchanged at 1. `cases_by_country.json` is now empty — the WHO DON does not attribute cluster cases to specific destination countries. Pre-cluster reporting preserved as historical news in `feed.json`. Reasoning in [METHODOLOGY.md §Scope](./METHODOLOGY.md). Retired figures preserved in earlier same-day commits (`b4729f3` pre-pivot, `<this commit's predecessor>` first-pivot). ([WHO DON 600](https://www.who.int/emergencies/disease-outbreak-news/item/2026-DON600))

> **2026-05-10** — *Editorial scope* — HantaTracker narrowed from "all hantaviruses" to "Andes virus (Orthohantavirus andesense) only" — the one hantavirus species with documented human-to-human transmission. Country rows for Brazil, Bolivia, Panama, Paraguay, Uruguay, and the United States retired. Their published case counts cover non-Andes hantaviruses (Sin Nombre in the USA, Choclo in Panama) or carry no Tier-1 strain attribution (Brazil, Bolivia, Paraguay, Uruguay) — Andes virus is documented in the literature for some of these countries but no Tier-1 strain-attributed figure has been published. Globals retired alongside: confirmed 235 → 107, suspected unchanged at 2, deaths 62 → 31, countriesReporting 15 → 9, activeOutbreaks 2 → 1 (Paraguay's Mariscal Estigarribia HPS outbreak dropped — strain not attributed). Reasoning in [METHODOLOGY.md §Scope](./METHODOLOGY.md). The retired figures are preserved in `snapshots/2026-05-10/` (the post-DON-600, pre-pivot snapshot was committed as `b4729f3`). ([WHO DON 600](https://www.who.int/emergencies/disease-outbreak-news/item/2026-DON600))

## Machine-readable data files

- https://hantatracker.net/data/cases_global.json
- https://hantatracker.net/data/cases_by_country.json
- https://hantatracker.net/data/feed.json
- https://hantatracker.net/data/kpis.json
- https://hantatracker.net/data/sources.json