Of the spread of the Delta variant, Osterholm agrees with Walensky, telling CNN: "This has real significant implications for increased transmission in our communities.

So I've obviously had a note of caution here with regard to the Delta variant, this new one we're talking—maybe the same thing will happen, but maybe it won't.

"In the high-income countries like the United States that have had the kind of vaccine programs that have been in place, we're not going to see big national surges, not like we did last January, but we're not done with this virus at all," he told CNN.

We have states where we're well below 40% with even a single dose of vaccine in people

So we have a lot of susceptible people out there yet that have not been vaccinated—that for example, should this Delta variant take over, we're going to see local and regional surges that are substantial

We're seeing that in other Southern states where we're beginning to see this emerging surge in a given county

This is all the more reason why we have to know that we're not done with the virus yet." So get vaccinated when it becomes available to you, and to protect your life and the lives of others, don't visit any of these 35 Places You're Most Likely to Catch COVID