The cases have been confirmed, so far, in Lisbon and Vale do Tejo, North and Algarve. The new 19 cases were confirmed by the National Institute of Health Dr Ricardo Jorge.

"All confirmed infections are in men between the ages of 20 and 61, with the majority under the age of 40," the note reads.

The DGS continues to monitor the situation at the national level in conjunction with the European institutions.