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.
cVDPV1 in Madagascar
As of 27 May 2026, one circulating vaccine-derived poliovirus type 1 (cVDPV1) case was reported in Madagascar, with onset of paralysis on 4 April 2026, from Sud-Ouest province. It is the first cVDPV1 case reported from the country since 2023 and is genetically linked to a virus detected in the country in 2022. Please see our Topics in Brief article for further details on polio.
Mpox in Colombia
As of 25 May 2026, three cases of clade Ib mpox have been reported in Colombia. Previous cases reported in Colombia have reported travel history to Spain and Belgium. Please see our Topics in Brief article for further information on mpox.
Mpox in Slovakia
As of 25 May 2026, five cases of clade Ib mpox have been reported in Slovakia. These are the first reports of confirmed clade I mpox in Slovakia. On 13 April 2026, a case of clade I mpox in Poland was reported with travel history to Slovakia. Please see our Topics in Brief article for further information on mpox.
Mpox in USA
Since November 2024, and as of 22 May 2026, 20 cases of clade I mpox have been reported in the United States. Clade Ib mpox has been sequenced from clade I cases in the US. Please see our Topics in Brief article for further information on mpox.
As of 17 October 2025, three confirmed cases of clade I mpox have been reported from Southern California. These cases have no recent travel history or known contact with one another indicating there is some community transmission amongst the MSM population in California. Please see our Topics in Brief article for further details on mpox.
Source: StateAs of 14 October 2025, one confirmed case of clade I mpox has been reported from Long Beach, California. The case had no known history of recent travel. Please see our Topics in Brief article for further details on mpox.
Source: StateAs of 18 June 2025, a fifth imported case of clade I mpox was reported from the US. The latest case was reported from Massachusetts state. All five cases reported to date had recent travel to countries with sustained clade I mpox transmission. Please see our Topics in Brief article for further details on mpox.
Source: StateAs of 12 February 2025, a fourth imported case of clade Ib mpox was reported from the US. The latest case was reported from New York State. Please see our Topics in Brief article for further details on mpox.
Source: StateAs of 7 February 2025, the third imported clade I mpox case was reported in the U.S. The latest case was reported from New Hampshire and had recently travelled to East Africa. Please see our Topics in Brief article for further details on mpox.
Source: StateAs of 22 January 2025, the second imported clade Ib mpox case was reported in the U.S. The latest case was reported from Georgia and had recently travelled to East Africa. Please see our Topics in Brief article for further details on mpox.
Source: PAHOAs of 16 November 2024, the Centers for Disease Control and Prevention (CDC) have reported the first case of mpox clade I in an individual who travelled from Eastern Africa to California. The risk remains low for the general population in the USA. Please see our Topics in Brief article for further details on mpox.
Source: CDCMeasles 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.
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.
As of 2 April 2026, a total of 580 dengue cases have been reported in New Caledonia since January 2026. DENV?1 is the predominant circulating serotype. Please see our Topics in Brief article for further details on dengue.
Source: SPCAs of 23 March 2026, a total of 394 dengue cases have been reported in New Caledonia since January 2026. Please see our Topics in Brief article for further details on dengue.
Source: StateMurray Valley encephalitis in Australia
On 19 May 2026, local health authorities in the Northern Territory reported two deaths from Murray Valley encephalitis. Both cases were reported from Alice Springs, one in April and the other in May 2026. Travellers should avoid mosquito bites.
MERS-CoV in France and Saudi Arabia
Between January 2025 and 29 April 2026, there have been 19 human cases of MERS reported – 17 reported by the Kingdom of Saudi Arabia, and two reported by France in December 2025 in individuals who had travelled to the Middle East. Please see our Topics in Brief article for further details on MERS-CoV.
Measles in Mexico
As of 7 May 2026, a total of 10,049 cases of measles have been reported in 2026. Please see our Topics in Brief article for further details on measles.
Dengue in Tonga
As of 5 May 2026, a total of 56 confirmed dengue cases have now been reported in Tonga. The highest number of cases have been reported from Tongatapu Island. Dengue virus serotype 2 (DENV-2) has been confirmed. Please see our Topics in Brief article for further details on dengue.
As of 20 April 2026, a total of 24 laboratory confirmed dengue cases have been reported in Tonga for 2026. The Ministry of Health have declared a dengue outbreak following an increase in confirmed and suspected cases, along with evidence of community transmission across Eua, Ha‘apai and Tongatapu. Please see our Topics in Brief article for further details on dengue.
Source: SPCNaTHNaC 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.
