Europe is facing a growing risk of new disease outbreaks — which may prove difficult to quickly detect and stop — as rising temperatures make the region more vulnerable to illnesses brought in by travelers and trade, a leading health expert has warned.

Tick-carried Lyme disease, for instance, is gaining ground from Russia to Britain to Croatia as temperatures rise, while dengue fever — carried in by travelers — risks gaining a foothold in Southern European countries such as Italy and Greece.

West Nile virus and malaria are also growing concerns, as is Zika, scientists say.