Key Points

• In 2021, in the Pays de la Loire region:

• 7 cases of dengue were reported during the enhanced surveillance period, from May 1, 2021, to November 30, 2021 (compared to 71 cases of dengue during the same period in 2020).

• All identified cases were imported, mainly from Réunion.

• No cases of chikungunya or Zika virus infection were reported in the region.

• None of the 7 cases in 2021 were subject to mandatory reporting. Awareness-raising efforts by the partners involved in this surveillance must continue and be strengthened ahead of the 2023 season.