Birx: U.S. should prepare for COVID surge in the South

• "What has happened each time is we've had a summer surge across the South and a winter surge that starts in our Northern Plains and moves down, accelerated by Thanksgiving and the holidays," Birx said.
• "Each of these surges are about four to six months apart," she added. "That tells me that natural immunity wanes enough in the general population after four to six months — that a significant surge is going to occur again."

What she's saying: "We have to make it very clear to the American people that your protection against infection wanes," she added. 

• "So if you're going to go see your grandmother, or someone that has metastatic breast cancer, or someone under treatment for Hodgkin's disease, or a family member with Down syndrome, you need to test before you go."