Pneumonia of Undetermined Etiology — Russian Federation
Undetermined (pneumonic plague suspected but not confirmed)
- REPORTED CASES
- 1
- REPORTED DEATHS
- 1
- FIGURES AS OF
- 2 Oct 2026
- HUMAN-TO-HUMAN TRANSMISSION
- Not documented
- WHERE
- Single country: Russian Federation (Irkutsk Oblast)
- STATUS
- active
- REPORTED BY
- WHO Disease Outbreak News ↗
- SOURCE UPDATED
- Source updated 10 days ago
WHAT IS HAPPENING · SUMMARY OF WHO DISEASE OUTBREAK NEWS
On 2 October 2026, an employee of the Irkutsk Antiplague Research Institute of Siberia and the Far East died following hospitalization for severe pneumonia on 29 September; pneumonic plague was suspected due to occupational exposure but not confirmed. The Russian Federation NFP confirmed the death and reported that laboratory testing of contacts detected no high-threat pathogens and all contacts remained asymptomatic throughout follow-up. Based on information provided by the NFP, WHO has not identified evidence of ongoing transmission associated with this event.
FOR THE GENERAL PUBLIC
The source has not published a general-public risk statement that ContagionMap holds. Follow your national public-health authority for advice where you live.
FOR TRAVELLERS
Follow the guidance in the official source.
WHAT IS KNOWN
- WHO Disease Outbreak News reports 1 cases and 1 deaths as of 2 Oct 2026.
- The source does not document person-to-person transmission in this outbreak.
WHAT IS UNCERTAIN
- A key uncertainty remains the absence of a confirmed diagnosis in the deceased laboratory worker. Test results were negative for tested high-threat pathogens, but the etiology has not been established.
- The case fatality rate (100%) rests on 1 cases and will move substantially as figures change.
CONTAGIONMAP ANALYSIS
Significance: Low. This is ContagionMap's rating of how severe the outbreak is where cases are occurring, based on the figures above and the pathogen. It is not an official WHO or government classification and is not a measure of risk to people elsewhere.
REPORTED FIGURES OVER TIME
OFFICIAL NOTICES
- Pneumonia of undetermined etiology - the Russian Federation — WHO Disease Outbreak News, 10 Oct 2026
Figures are as reported by the named source on the date shown. Summaries and the significance rating are ContagionMap's. This record last changed on ContagionMap 11 Oct 2026. Not medical advice.