Via the Health Protection Agency:
Dengue fever cases in Madeira, Portugal. Excerpt:
The Health Protection Agency (HPA) is aware of 18 confirmed cases and 191 probable cases of dengue fever in Madeira, Portugal since early October 2012.
This is the first time that dengue fever has been reported in Madeira. Dengue is a mosquito-borne viral infection and it is important that all travellers should avoid mosquito bites when visiting the region. It can cause a range of clinical symptoms from a mild flu-like illness to a more serious illness including rash and bone pain and can sometimes lead to severe complications.
There have not been any cases of dengue fever in UK travellers associated with travel to Madeira to date and the risk for travellers and residents will depend on the course of the outbreak in the coming weeks. The health authorities in Madeira are investigating and implementing control and prevention measures, alongside a public awareness campaign.