In other developments, Uganda said it will start vaccinating health workers in high-risk areas and two global health experts pressed for more high-level involvement in ending the outbreak, including committment from the United States.
Investigators were't able to determine exactly how the water contaminated the lettuce, which may have occurred by irrigation or the dilution of chemical to protect crops.
The DRC health ministry reports 6 cases today, and deaths have climbed to 180.
Three were hospital contacts in a hospital in Dammam, and two were household contacts in Riyadh.
Both studies found that antibiotics in the first 2 years of life were associated with increased weight gain.
The Security Council passed a resolution to "ensure full, safe, immediate, and unhindered access" in outbreak areas.
For all three vaccines, protection lasted 2.5 years, the longest yet in ongoing studies to assess the potential impact of Ebola immunization.
The cases bring the total to 274, including 139 deaths.
With 6 new infections, the outbreak total reaches 257 cases and 164 deaths.
Prior vaccination did not reduce the subsequent season's vaccine effectiveness in children 2 to 17 years old.
Cefiderocol has a novel way of penetrating the outer membrane of gram-negative bacteria, including resistant ones.