With 2 new Saudi cases, results of a gene study hint at enhanced transmissibility.
Saudi Arabia has had 18 MERS cases since Sep 4, 15 of them in Riyadh.
At least 3 of the 6 new cases involve recent contact with another MERS patient.
The group based much of its findings on an Aug 23 WHO mission to Saudi Arabia.
Also, the WHO's MERS emergency committee met today to discuss the latest outbreak developments.
Also, Saudi officials reported four more cases from Riyadh, and South Korea announced new prevention steps in the wake of its outbreak.
New reports indicate hospital MERS outbreaks in both Saudi Arabia and Jordan.
Three of the four new cases appear to involve contact with other patients, and the ECDC issues a risk assessment.
In a related development, the WHO provided more details on 13 recent Saudi cases, 12 with hospital-outbreak links.
In addition, a new WHO update details 29 recent cases from Riyadh, 24 of them connected to a large hospital outbreak.
