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.
Warrap
cVDPV2 in South Sudan
As of 2 September 2026, a total of three circulating vaccine-derived poliovirus type 2 (cVDPV2) cases were reported from Jonglei and Warrap states in South Sudan. These are the first cVDPV2 cases reported in 2026. Onset of paralysis was reported in May, June and July 2026 respectively. Please see our Topics in Brief article for further details on polio.
Monagas
Barinas
Lara
Yellow fever in Venezuela
As of 29 August 2026, a total of nine yellow fever cases, with three deaths, have been reported in four states of Venezuela during 2026: Aragua, Barinas, Lara and Monagas. Please see our Topics in Brief article for further details on yellow fever.
Mpox in France
As of 28 August 2026, 173 confirmed clade Ib mpox cases have been reported in France. Please see our Topics in Brief article for further details on mpox.
Mpox in Angola
As of 28 August 2026, 274 confirmed clade Ib mpox cases have been reported in Angola. Please see our Topics in Brief article for further details on mpox.
Lassa fever in Nigeria
As of 23 August 2026, a total of 1,056 confirmed Lassa fever cases, with 7,580 suspected cases, six probable cases and 253 deaths, have been reported across 24 states in Nigeria for 2026. Please see our Topics in Brief article for further details on Lassa fever.
Dengue in Vanuatu
As of 31 August 2026, a total of 112 confirmed dengue cases have been reported in Vanuatu since 14 June 2026. The outbreak remains active, with ongoing local transmission in affected communities across South-West Efate, Shefa Province. The most affected areas continue to be Erakor (31%), Port Vila (22%), Eratap (21%), and Pango (16%). DENV-1 has been confirmed as the circulating serotype. Please see our Topics in Brief article for further details on dengue.
West Nile virus in USA
As of 1 September 2026, a total of 407 human cases of West Nile virus have been reported across 40 states in the United States. Of these, 285 cases were reported to be the neuroinvasive form. The highest number of cases have been reported in Arizona (88 cases), California (66 cases) and Texas (46 cases). Please see our Topics in Brief article for further details on West Nile virus.
Diphtheria in Italy
On 20 August 2026, a fatal case of diphtheria has been confirmed in a child in Palermo, Sicily. A second probable case has been reported in another child who is unwell and is a contact of the first case. A further ten family members are reported to have tested positive, but remain well. Please see our Topics in Brief article for further details on diphtheria.
Cyclosporiasis in USA
As of 24 August 2026, 17,180 confirmed locally acquired cyclosporiasis cases, including two deaths have been reported in 48 states and the district of Columbia in the USA. A further 11,844 cases are under investigation.
Measles in Sweden
As of 27 August 2026, a total of 35 measles cases have been reported in Sweden in connection with the Ukult festival which took place between 30 July and 2 August 2026. Please see our Topics in Brief article for further details on measles.
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.
