Question to the Department of Health and Social Care:

To ask His Majesty's Government, further to the Written Answer by Lord Markham on 13 October (HL2369), what measures they have in place to monitor for an increase in dengue fever cases; how many cases would be sufficient to warrant further investigation; and what such investigations may involve.

Dengue fever cases reported in the United Kingdom have been acquired as a result of travelling to endemic areas, such as South and South East Asia, South and Central America, Africa and the Caribbean. The UK Health Security Agency (UKHSA) advises health professionals to be alert to the possibility of dengue fever in returning travellers. Where a case is suspected, health professionals should contact the UKHSA’s Rare and Imported Pathogens Laboratory for advice and diagnosis.

There is no pre-determined threshold for the number of cases which would warrant a response. Laboratory clinical and epidemiological teams monitor changes in the pattern of diagnosis and respond as appropriate, such as updating current advice for travellers and the National Health Service, increasing diagnostic testing and reporting in accordance with international health regulations. The UKHSA also works with local authorities, port health and the Animal and Plant Health Agency to monitor points of entry for the invasive mosquito species currently implicated in local cases of dengue in France.