The cases have no history of travel out of their district of residence in the 15 days prior to the onset of symptoms.
French public health authorities have implemented the following public health measures:
- Vector control aimed at preventing local transmission.
- Provision of information about the awareness of the cluster, the signs and symptoms of the disease, when and where to seek care, and how to prevent infection.
- Advice to health care practitioners on clinical case management.
- Assessment of the risk of infection through blood and tissues donations.