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.
Measles in Japan
As of 20 May 2026, a total of 498 measles cases have been reported in Japan for 2026. Please see our Topics in Brief article for further details on measles.
Lassa fever in Nigeria
As of 10 May 2026, a total of 793 confirmed Lassa fever cases, with 5,034 suspected, five probable cases and 204 deaths, have been reported across 23 states in Nigeria for 2026. This includes 45 cases in health workers. Please see our Topics in Brief article for further details on Lassa fever.
Diphtheria in Australia
On 18 May 2026, the Australia Centre for Disease Control reported an increase in the number of diphtheria cases across Australia, with a total of 221 confirmed cases reported in 2026. The majority of cases have been reported in the Northern Territory (133 cases) and Western Australia (79 cases). Please see our Topics in Brief article for further details on diphtheria.
Ebola disease in DRC
As of 24 May 2026, a total of 101 confirmed and over 900 suspected Ebola disease cases, with ten confirmed and 220 suspected deaths, have now been reported from the Democratic Republic of the Congo. Please see our Topics in Brief article for further details on Ebola disease.
Ebola disease in Uganda
On 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.
Hantavirus - cruise ship
On 22 May 2026, the World Health Organization reported an Andes hantavirus case in a crew member of the MV Hondius cruise ship. The case had disembarked in Tenerife, was repatriated to the Netherlands and had been isolating since then. As of 22 May 2026, 12 confirmed cases and three deaths had been reported as part of the outbreak. On 25 May 2026, the Ministry of Health in Spain reported a new confirmed hantavirus case in an individual remaining in quarantine in Spain. Please see our Topics in Brief article for further details on hantavirus.
Ebola disease in Germany ex DRC
On 22 May 2026, the Charite University Hospital in Berlin reported that a US citizen medically evacuated from the Democratic Republic of the Congo with Ebola disease, has tested positive for Bundibugyo virus. Please see our Topics in Brief article for further details on Ebola disease.
Chikungunya in French Guiana
As of 21 May 2026, a total of 249 laboratory confirmed chikungunya cases have been reported in French Guiana since the first locally acquired case was reported in January 2026. Please see our Topics in Brief article for further details on chikungunya.
Dengue in New Caledonia
As of 21 May 2026, a total of 1,786 dengue cases have now been reported in New Caledonia since January 2026. Please see our Topics in Brief article for further details on dengue.
Chikungunya in Mauritius
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.
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.

