The U.S. is reporting an average of about 24,155 infections per day over the past week, down 23% from a week ago. About 50% of the U.S. population has had at least one shot, according to the CDC, with more than 131 million Americans, or almost 40%, fully vaccinated. For those not vaccinated, CDC Director Dr. Rochelle Walensky urged caution over the upcoming Memorial Day holiday, noting that those who have gotten a shot are protected.