Outbreaks under monitoring: week 38 (week ending 21 September 2025)
Updated 31 December 2025
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| Disease or pathogen | Chikungunya |
|---|---|
| Location | France |
| Reporting date | 17 September 2025 |
| Summary | Between 1 May and 15 September 2025, were recorded in mainland France. This is an increase of 178 cases since the . On 17 September 2025, Sante Publique France reported that several metropolitan regions in France are experiencing an . The reported number of locally acquired chikungunya cases in France is the highest since 2010. In the United Kingdom (UK), an increase in travel-associated chikungunya cases has been reported in 2025. Most cases reported travel to Sri Lanka, India and Mauritius. No locally acquired cases of chikungunya have ever been reported in the UK. |
| Further information |
Chikungunya: transmission, epidemiology and guidance Chikungunya: epidemiology in England, Wales and Northern IrelandÌý |
| Disease or pathogen | Ebola virus disease |
|---|---|
| Location | Democratic Republic of the Congo (DRC) |
| Reporting date | 4 to 18 September 2025 |
| Summary | On 4 September 2025, the DRC’s Ministry of Health of Ebola virus disease (EVD) in Bulape health zone, Kasai Province. This is the sixteenth EVD outbreak reported in the DRC. According to the World Health Organization (WHO), and 31 deaths have been reported from Bulape, Kasai province as of 17 September 2025. The in the current outbreak were discharged on 15 September 2025. As of 16 September 2025, 523 Ìýhealthcare workers in Bulape and contacts of confirmed cases have been vaccinated. WHO assesses the of this outbreak as high at the national level, moderate at the regional level and low at the global level. Imported cases of Ebola disease (EBOD) are very rare in the UK. Four confirmed cases of EBOD, and no deaths, have been previously reported in the UK. The last reported confirmed case of was in 2014. |
| Further information |
Ebola: overview, history, origins and transmission Ebola virus disease: clinical management and guidance Ebola and Marburg haemorrhagic fevers: outbreaks and case locations . |
| Disease or pathogen | Nipah virus (NiV) infection |
|---|---|
| Location | Bangladesh |
| Reporting date | 18 September 2025 |
| Summary | On 18 September 2025, the WHO reported that were recorded in Bangladesh between 1 January and 29 August 2025. According to the WHO, the cases had symptom onset dates between 25 January and 3 August 2025. No epidemiological link was identified between the cases. Three of the cases had a history of consuming raw date palm sap while the fourth case’s source of infection is still being investigated. The NiV cases who consumed raw date palm sap were reported during the expected season for NiV outbreaks (December to May), while the fourth case presented outside of this seasonal pattern. Since the first Nipah virus outbreak in Bangladesh in 2001 and as of 18 September 2025, 347 NiV cases have been reported. No NiV cases (including travel-associated) have ever been reported in the UK. |
| Further information |
Nipah virus: epidemiology, outbreaks and guidance |
For more information on the background and methods used in this report, seeÌýOutbreaks under monitoring: background and methodology.