News
Japanese encephalitis vaccine out of stock: advice for travellers and health professionals
Important advice on Japanese encephalitis vaccine shortage for health professionals
Mosquito and insect spread infections in the Caribbean
An increase in cases of mosquito and insect spread infections have been reported in the Caribbean region
Changes to the Country Information pages: Zika
NaTHNaC has reviewed and updated country-specific Zika information and prevention advice
Traveller advice resources
New formats available for the UKHSA and NaTHNaC travel health information
Factsheets
Dengue
Dengue is an infection caused by the dengue virus of which there are four different subtypes. The disease is transmitted by mosquitoes
Diseases spread by insects and ticks in the American continent (the Americas)
Depending on the destination, travellers may be at risk of a number of different diseases
Diseases spread by insects and ticks in Europe
Depending on destination, travellers may be at risk of a number of different diseases spread by insects or ticks in Europe
Zika virus: Evaluating the risk to individual travellers
Factors to consider when assessing risk of Zika virus
Chikungunya
This viral infection occurs in some tropical and subtropical regions of the world, predominantly transmitted through the bite of an infected Aedes mosquito
Topics
Dengue
Dengue is an infection caused by the dengue virus of which there are four different types (serogroups) and transmitted through the bite of an infected mosquito
Chikungunya
Chikungunya is a viral infection caused by the chikungunya virus (CHIKV) and is transmitted through the bite of an infected mosquito
Outbreaks
West Nile virus in USA
As of 11 August 2026, a total of 181 human cases of West Nile virus have been reported across 30 states in the United States this year. Of these, 129 cases were reported to be the neuroinvasive form. The highest number of cases have been reported in Arizona (73 cases), Texas (23 cases), and California (18 cases). Please see our Topics in Brief article for further details on West Nile virus.
