FILE - RNs reposition a patient in the ICU inside Little Company of Mary Medical Center Friday, July 30, 2021 in Torrance, CA. RELATED: Moderna: Vaccine 93% effective up to 6 months but booster likely needed before winter Overall, 83% of the counties across the country are experiencing moderate or high transmission rates, "with delta variants continuing to be the predominant circulating virus," Walensky continued.