Once limited to tropical regions in Asia, Africa, and Latin America, dengue is now surfacing in areas previously considered low-risk. Warmer temperatures and changing rainfall patterns have allowed the Asian tiger mosquito to thrive in southern Europe, with Spain, Italy, and parts of Greece reporting localized outbreaks for the first time. By spring 2025, three outbreaks in the Mediterranean had already been documented, prompting travelers and insurers to re-examine coverage gaps.