Please note that not all cases of disease or outbreaks are reported; some outbreaks may only be reported if they occur outside of the usual recognised risk area or season, or they have been reported in greater than usual numbers. See 'About Outbreaks' tab below for further detail.
For further information on red, amber and green alert categories, see About Outbreaks tab.
Dengue in USA
On 4 August 2026, the Virginia Department of Health reported a confirmed dengue virus infection in a resident who did not have known travel outside of Virginia prior to disease onset. The case had been in close proximity to a recent internationally acquired dengue case. There is no evidence of continued transmission and no additional reports of locally acquired dengue cases.
Zika in USA ex Fiji
As of 4 August 2026, the US Centers for Disease Control and Prevention (CDC) have reported three laboratory-confirmed Zika virus infections in US travellers for whom Fiji was the only destination visited. The cases were confirmed in May 2025, March and June 2026. Please see our Topics in Brief article for further details on Zika virus.
Ebola disease in Uganda
On 28 July 2026, the Ministry of Health of Uganda declared the end of the Ebola disease outbreak in Uganda, after 42 days without a new confirmed locally transmitted case. The last confirmed case was discharged on 16 June 2026. Please see our Topics in Brief article for further details on Ebola disease.
As of 21 June 2026, 20 confirmed cases of Ebola disease including two deaths have been reported in Uganda. Please see our Topics in Brief article for further details on Ebola disease.
Source: StateAs of 14 June 2026, 19 confirmed cases of Ebola disease and one probable case, including two confirmed and one probable death, have been reported in Uganda. Please see our Topics in Brief article for further details on Ebola disease.
Source: WHOAs of 6 June 2026, 19 confirmed cases of Ebola disease and two deaths have been reported in Uganda. Please see our Topics in Brief article for further details on Ebola disease.
Source: WHOAs of 4 June 2026, 16 confirmed cases of Ebola disease (one of which was fatal) have been reported in Uganda. Please see our Topics in Brief article for further details on Ebola disease.
Source: StateAs of 2 June 2026, a total of 15 confirmed Ebola disease cases, with one confirmed death, have been reported in Uganda. Please see our Topics in Brief article for further details on Ebola disease.
Source: StateOn 29 May 2026, two new cases of Ebola disease have been confirmed in Uganda. This brings the total number of confirmed cases to nine, including one death. Please see our Topics in Brief article for further details on Ebola disease.
Source: StateOn 25 May 2026, two additional confirmed cases of Ebola disease among healthcare workers were reported in Uganda. This brings the total number of reported cases in Uganda to seven, including one confirmed death. Please see our Topics in Brief article for further details on Ebola disease.
Source: WHOOn 23 May 2026, the World Health Organization (WHO) reported three additional cases of Ebola disease (EBOD) caused by the Bundibugyo virus. This brings the total number reported in Uganda to five, with a health worker amongst those affected. Please see our Topics in Brief article for further details on Ebola disease.
Source: WHOThe Director-General of the World Health Organization (WHO), has declared that the Ebola disease caused by Bundibugyo virus in the Democratic Republic of the Congo and Uganda constitutes a public health emergency of international concern (PHEIC). Two laboratory confirmed cases (including one death) with no apparent link to each other have been reported in Kampala, Uganda, within 24 hours of each other, on 15 and 16 May 2026, among two individuals travelling from the Democratic Republic of the Congo. Please see our Topics in Brief article for further details on Ebola disease.
Source: WHOChikungunya in Guinea
The first locally acquired case of chikungunya has been confirmed in Guinea. Details are included in a study published on 30th July 2026. Further details on date and location of detection are not yet available. Please see our Topics in Brief article for further details on chikungunya.
West Nile virus in Canada
On 30 July 2026, the first case of West Nile virus during 2026 was reported in Toronto, Canada. Please see our Topics in Brief article for further details on West Nile virus.
Cyclosporiasis in United Kingdom ex Mexico and USA
Between 30 April and 15 July 2026, 67 cases of cyclosporiasis were reported in the UK (30 in England, 27 in Scotland and 10 in Wales). Of the 51 cases with travel information available, 48 reported travel to Mexico, with one reporting both travel to Mexico and the USA.
Cholera in South Sudan
As of 26 July, 109,049 cholera cases and 1,716 deaths have been reported across 55 counties in nine states across South Sudan, since the outbreak began in September 2024. This outbreak is the largest in South Sudan since 2011. Please see our Topics in Brief article for further details on cholera.
As of 16 February 2026, a total of 98,372 cholera cases, including 1,624 deaths, have been reported in South Sudan since this outbreak began in September 2024. Cases have been reported in 55 counties, across nine states and all three administrative areas. Please see our Topics in Brief article for further details on cholera.
Source: StateAs of 28 October 2025, a total of 94,549 cases of cholera including 1,567 deaths have been reported since the start of the outbreak. Nine out of ten states have been affected with the majority of cases reported in Rubkona, Juba, Mayom and Aweil West. Please see our Topics in Brief article for further details on cholera.
Source: WHOAs of 3 March 2025, over 57,100 cases of cholera and 1,500 deaths have been reported since the start of the outbreak. Cases have been reported in 88 localities across 12 states. Please see our Topics in Brief article for further details on cholera.
Source: WHOOn 22 January 2025, the World Health Organization reported that the current cholera outbreak in South Sudan has recorded 21,000 cases and 367 deaths. Cases have been reported in 31 out of 80 counties across seven states. Please see our Topics in Brief article for further details on cholera.
Source: WHOAs of 21 December 2024, 4,793 suspected and confirmed cases of cholera, including 47 deaths, have been reported. There has been a 147% increase in case numbers over the previous four week period. Six out of ten states have been affected. Severe flooding and mass displacement of people have worsened the situation. Please see our Topics in Brief article for further details on cholera.
Source: Africa CDCDengue in Cambodia
As of 12 July 2026, a total of 28,074 cases (38 deaths) of dengue fever have been reported in Cambodia during 2026. This represents a 58.1% increase compared to the same period in 2025. Please see our Topics in Brief article for further details on dengue.
Yellow fever in Colombia
As of 28 July 2026, a total of 56 confirmed yellow fever cases, including 28 deaths, have been reported since the start of the year. This brings the total confirmed cases since 2024 to 204 (91 deaths). The Department of Tolima has reported the majority of cases. Please see our Topics in Brief article for further details on yellow fever.
As of 28 June 2026, a total of 53 confirmed yellow fever cases, including 26 deaths, have been reported since the start of the year. This brings the total confirmed cases since 2024 to 201 (89 deaths). The Department of Tolima has reported the majority of cases. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 14 June 2026, a total of 51 confirmed yellow fever cases, including 24 deaths have been reported since the start of the year. Please see our Topics in Brief article for further details on yellow fever.
Source: StateIn 2026, up to 6 April, 35 confirmed yellow fever cases including 18 deaths have been reported in Colombia. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 17 March 2026, 390 probable and 30 confirmed cases of yellow fever have been reported in Colombia during 2026. All cases so far in 2026 have been reported in Tolima. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 8 February 2026, a total of 168 confirmed yellow fever cases, including 76 deaths, have now been reported in Colombia since this outbreak began in 2024. Please see our Topics in Brief article for further details on yellow fever.
Source: StateBetween 2024 and 21 January 2026, a total of 157 confirmed yellow fever cases, including 70 deaths, were reported in Colombia. The departments of Caldas, Caquetá, Cauca, Guaviare, Huila, Meta, Nariño, Putumayo, Tolima and Vaupes have all reported fatal cases. Tolima department remains the most affected with 137 cases (55 deaths). Please see our Topics in Brief article for further details on yellow fever.
Source: StateBetween 2024 and 4 January 2026, a total of 142 confirmed yellow fever cases, including 63 deaths, were reported in Colombia. The departments of Caldas, Caquetá, Cauca, Guaviare, Huila, Meta, Nariño, Putumayo, Tolima and Vaupes have all reported fatal cases. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 19 October 2025, a total of 136 confirmed yellow fever cases (60 deaths), have been reported in Colombia during 2024/25. The majority of cases have been reported in Tolima Department with 116 cases and 45 deaths. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 23 September 2025, a total of 134 confirmed yellow fever cases (58 deaths), have been reported in Colombia during 2025. The majority of cases have been reported in Tolima Department with 114 cases and 43 deaths. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 31 July 2025, a total of 125 confirmed yellow fever cases, and 53 deaths, have now been reported in Colombia. The majority of cases have been reported in Tolima Department with 105 cases and 38 deaths. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 23 July 2025, a total of 103 confirmed yellow fever cases, with 37 deaths, have now been reported in Tolima Department. A public vaccination campaign is ongoing, with more than 728,000 doses of yellow fever vaccine administered. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 26 May 2025, a total of 97 cases of yellow fever have been reported since the start of 2024. Most cases have been reported in Tolima (78 cases). Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 29 April 2025, the Ministry of Health have reported 83 yellow fever cases, including 37 deaths, since the start of 2024. 60 of these cases (24 deaths) have been recorded in 2025. 10 departments have reported cases with Tolima and Putumayo most affected. Please see our Topics in Brief article for further details on yellow fever.
Source: StateOn 15 April 2025, the local authorities in Tolima reported a total of 57 yellow fever cases, with 23 deaths, in the department. Local vaccination campaigns are underway in Tolima. Please see our Topics in Brief article for further details on yellow fever.
Source: StateOn 27 March 2025, the local authorities in Tolima reported a total of 44 yellow fever cases, with 19 deaths, in Tolima. Please see our Topics in Brief article for further details on yellow fever.
Source: StateAs of 11 March 2025, a total of 40 confirmed yellow fever cases, with 19 deaths, have been reported in Colombia since 2024. The outbreak is still active in Tolima, where 29 cases and 12 deaths have been recorded between September 2024 and February 2025. Cases have also been confirmed in Caquetá, Huila, Nariño, Putumayo and Vaupés. Please see our Topics in Brief article for further details on yellow fever.
Source: PAHOAs of 14 February 2025, a total of eight confirmed cases of yellow fever, with two deaths have been reported in the department of Tolima since the beginning of 2025. Please see our Topics in Brief article for further details on yellow fever.
Source: PAHOOn 11 February 2025, the local authorities in Tolima issued an 'Orange' hospital alert due to an increase in yellow fever cases reported in Tolima since 2024. Please see our Topics in Brief article for further details on yellow fever.
Source: StateIn 2024, a total of 23 confirmed cases of yellow fever were reported, including 13 deaths. Since the start of 2025, a total of eight confirmed cases have been reported, including two deaths. Please see our Topics in Brief article for further details on yellow fever.
Source: PAHOAs of 7 November 2024, 26 cases of yellow fever have been reported during 2024. Most cases have been reported from Tolima province. Please see our Topics in Brief article for further details on yellow fever.
Source: StateHantavirus in Chile
As of 28 July 2026, 46 cases of hantavirus (18 deaths) have been reported from the Valparaiso, Metropolitana, O'Higgins, Maule, Nuble, Biobío, La Araucania, Los Rios, Los Lagos and Aysen regions. The Ministry of Health in Chile have declared a 'Health Alert' for hantavirus, which extends from the regions of Atacama to Magallanes and will be in force until July 31, 2027. Please see our Topics in Brief article for further details on hantavirus.
As of 8 November 2025, 35 cases of hantavirus pulmonary syndrome (including seven deaths) have been reported in Chile during 2025. Cases have been reported across a number of regions with 88.6% being exposed in rural areas. Please see UKHSA guidance for more details on hantavirus.
Source: PAHONaTHNaC regularly review and update information on disease outbreaks and other health issues that may affect the UK traveller. You can search the information by disease or by country in our Outbreak Surveillance section.
The information comes from a wide variety of sources and can be used along with the Country Information section of our website where you will find recommendations on vaccines, malaria and other risks for each country (where relevant).
Please note that not all cases of disease or outbreaks are reported. In some countries, there may be limited surveillance and reporting processes in place so information can be difficult to obtain. Some diseases may only be reported if they occur outside of the usual recognised risk area or season, or they have been reported in greater than usual numbers. Outbreaks of those diseases included in the UK childhood vaccination programme are not usually reported unless the outbreak is unusual or unexpected.
The information presented in the disease surveillance reports is collated from a variety of sources, including government bodies, international organisations and the media. The verification status of each report is clearly indicated. Verified reports are confirmed by official sources. Some unverified reports are included to ensure timely dissemination of information and where possible we will try to substantiate these reports, although confirmation may not always be possible. Unverified reports may be subject to change, misreporting and may later prove to be unsubstantiated. They should not therefore be regarded as official.
Where available, a web link is provided to the original information source. We cannot accept responsibility for the sites to which it links, or for the information found on those sites. Linking to outside sites does not in any way imply endorsement of these sites. If you wish to use the following content for official purposes, please refer to the original sources of information.
Key to NaTHNaC alert level feature
LEVEL 1: GREEN |
Take usual precautions
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Follow standard protective measures, as recommended for this destination, disease or situation. Be aware that advice may change and check for updates. |
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LEVEL 2: AMBER |
Take extra precautions
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Follow any additional precautions recommended. Be alert and check regularly for changes in advice about this ongoing situation. Advice may be relevant for all travellers or apply to a specific group of travellers. |
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LEVEL 3: RED |
FCDO advise against travel
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The Foreign, Commonwealth & Development Office (FCDO) advise against travel on health grounds. This may mean avoiding non-essential travel, or all travel, follow the FCDO advice for details. Please note we do not report on FCDO safety and security alerts. Travellers should check the FCDO travel advisories for their destination for this information. |
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Alert categories are based on the situation at the time of publication. They will not be routinely updated unless outbreak information or a news item is updated.
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