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.
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.
As of 1 June 2026, a total of 11 confirmed yellow fever cases, including six deaths, have been reported in Brazil for 2026. Most cases (nine) were reported in Sao Paulo state. Please see our Topics in Brief article for further details on yellow fever.
Source: StateOn 14 May 2026, two deaths from yellow fever were reported in the Vale de Paraiba region of Sao Paolo state. This brings the total number of cases in the state during 2026 to nine, including five deaths. Please see our Topics in Brief article for further details on yellow fever.
Source: StateMpox 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.
As of 9 April 2025, a total of five confirmed clade Ib mpox cases have been reported in Thailand. All cases had a history of international travel. Please see our Topics in Brief article for further details on mpox.
Source: WHOAs of 26 January 2025, a total of four confirmed clade Ib mpox cases have been reported in Thailand. All cases had a history of international travel. Please see our Topics in Brief article for further details on mpox.
Source: WHOOn 22 August 2024, clade Ib mpox was confirmed in a traveller who returned to Thailand from an African country experiencing a mpox outbreak on 14 August 2024.
Source: StateRabies 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.
On 17 June 2025, the Namibia Ministry of Agriculture confirmed the first case of rabies in a Cape fur seal in Walvis Bay Lagoon. The seal was observed to display signs consistent with rabies on 13 June 2025 and later died. See our Topics in Brief article for further details on rabies.
Source: World Organisation for Animal HealthChikungunya 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.
On 2 April 2026, the Ministry of Health and Wellbeing reported a significant increase in chikungunya cases. At the time, 105 active cases were reported, particularly in the regions of Rose-Hill, Quatre-Bornes, and Roches Brunes. On May 14, 2026 the US CDC issued a Travel Alert regarding an increased risk of chikungunya to travellers visiting Mauritius. Please see our Topics in Brief article for further details on chikungunya.
Source: StateChikungunya 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.
Hantavirus in Venezuela
As of 21 July 2016, three deaths from hantavirus have been reported in Boca del Pao, Anzoátegui State. Please see UKHSA guidance for more details on hantavirus.
Measles in Guatemala
As of 11 July 2026, a total of 27,145 measles cases have been reported in 2026. The substantial increase in case numbers reflects a retrospective update of cases in Guatemala and a change in case reporting. Please see our Topics in Brief article for further details on measles.
As of 7 May 2026, a total of 5,399 cases of measles have been reported in 2026. Please see our Topics in Brief article for further details on measles.
Source: PAHOZika in United Kingdom ex Malaysia
The UK Health Security Agency (UKHSA), have confirmed a case of Zika virus in a traveller who had returned from Malaysia in January 2026. Please see our Topics in Brief article for further details on Zika virus.
Zika in United Kingdom ex Maldives
The UK Health Security Agency (UKHSA), have confirmed a case of Zika virus in a traveller who had returned from the Maldives in February 2026. Please see our Topics in Brief article for further details on Zika virus.
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
|
Follow standard protective measures, as recommended for this destination, disease or situation. Be aware that advice may change and check for updates. |
|
LEVEL 2: AMBER |
Take extra precautions
|
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. |
|
LEVEL 3: RED |
FCDO advise against travel
|
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. |
|
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.
