Ticks of the genus Hyalomma, which have been observed in the south of France for several years, could potentially spread throughout metropolitan France as a result of climate change. These ticks can transmit Crimean-Congo haemorrhagic fever (CCHF), among other diseases. No indigenous cases have been detected in humans in France, but cases are recorded every year in Spain. In its scientific expert appraisal, ANSES confirms the risk of emergence and calls for the nationwide surveillance of these ticks.