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 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.
Hantavirus in Venezuela
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.
Japanese encephalitis in Taiwan
As of 28 July 2026, a total of ten confirmed Japanese encephalitis cases, including one death, have been reported in Taiwan in 2026. Most cases have been reported in Taoyuan City (6 cases). Please see our Topics in Brief article for further details on Japanese encephalitis.
North Kivu
South Kivu
Tshopo
Haut-Uele
Ebola disease in DRC
As of 26 July 2026, a total of 3,262 confirmed Ebola cases and 1,437 deaths have been reported in five provinces: Ituri, North Kivu, South Kivu, Tshopo and Haut-Uele. Please see our Topics in Brief article for further details on Ebola disease.
Yellow fever in Brazil
As of 23 July 2026, a total of 15 confirmed yellow fever cases including eight deaths have been reported in Brazil. Most (11 cases) have been reported in Sao Paulo state. Please see our Topics in Brief article for further details on yellow fever.
Measles in USA
As of 23 July 2026, a total of 2,318 confirmed measles cases have been reported across 45 states of the United States in 2026. This is exceeds the number of cases reported for the whole of 2025 and is the highest number of measles cases reported in the US for 35 years. Please see our Topics in Brief article for further details on measles.
Dengue in France
On 20 July 2026, two locally acquired dengue cases were reported from the Occitanie region of France. Please see our Topics in Brief article for further details on dengue.
Rabies in South Africa
Since 2024, more than 100 cases of rabies have been confirmed in Cape fur seals in South Africa and Namibia. See our Topics in Brief article for further details on rabies.
Lassa fever in Nigeria
As of 12 July 2026, a total of 963 confirmed Lassa fever cases, with 6,554 suspected, six probable cases and 229 deaths, have been reported across 23 states in Nigeria for 2026. Please see our Topics in Brief article for further details on Lassa fever.
Welcome to our outbreak surveillance section. This page contains information on disease outbreaks and other incidents that are considered to be of relevance to UK travellers.
You can search the information by disease or by country.
We regularly review and update information on overseas disease outbreaks and other health issues that may affect the UK traveller. 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.
You can search our Outbreak Surveillance information by disease or by country.
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.
If you wish to use the following content for official purposes, please refer to the original sources of information. 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.
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. Please note we do not report on FCDO specific travel advice where the FCDO advises British people against ‘all but essential travel’ or ‘all travel’ to a particular country. For changes to travel advice for a specific country, you can sign up to receive email alerts. |
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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.
The categories do not replace Foreign, Commonwealth and Development Office (FCDO) travel advice. Travellers should still check the FCDO travel advisories for any country-specific security or safety alerts.
