President Emmanuel Macron said on Wednesday said French teenagers aged 12-18 will be eligible for COVID-19 vaccination from June 15.

The announcement comes as France hit a vaccination milestone on Wednesday, with 50 percent of the adult population vaccinated with a first dose.

“Today we will pass the symbolic mark of 50 percent of adults having received a first jab,” government spokesman Gabriel Attal told reporters earlier on Monday at a regular press briefing.

But Macron also warned that the French should remain “extremely cautious” as coronavirus indicators deteriorated in southwestern regions.

The deterioration was “particularly marked in the Pyrénées-Atlantiques” and “to a lesser extent in Charente-Maritime, Lot-et-Garonne, Charente, Landes and Gironde” areas, Attal said.

He warned against relaxing measures too early.

The EU regulator authorized Pfizer-BioNTech’s COVID-19 vaccine for use in children as young as 12 last week.