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.
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.
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 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.
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 (six cases). Please see our Topics in Brief article for further details on Japanese encephalitis.
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.
Mpox in Thailand
As of 24 July 2026, a total of 88 confirmed clade Ib mpox cases have been reported in Thailand. Please see our Topics in Brief article for further details on mpox.
Rabies in Namibia and 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.
Chikungunya in Mauritius
As of 12 July 2026, a total of 6,675 confirmed cases of chikungunya have been reported from the islands of Mauritius (6,583) and Rodrigues (92) in 2026. Please see our Topics in Brief article for further details on chikungunya.
Chikungunya in Costa Rica
On 13 July 2026, the U.S. Embassy in Costa Rica reported an outbreak of chikungunya in Playa Langosta and the surrounding Guanacaste coast including the Santa Cruz area. 45 suspected cases (four confirmed, 17 probable) have been recorded. On 16 July 2026 the US CDC issued a Travel Alert regarding an increased risk of chikungunya to travellers visiting this area. Please see our Topics in Brief article for further details on chikungunya.
NaTHNaC 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.
