What's Behind The COVID Surge In States With High Vaccination Rates?

Colorado, California and now New Mexico, where the vaccination rate is 73%, all are seeing COVID surges.

Around the country, the average number of new COVID cases has been relatively stable. But that's not the case everywhere, especially out West in states where vaccination rates are relatively high. So what's behind the surge? 

The short answer is experts and doctors don't know exactly what is driving this surge, but one thing they do know is: It is likely to get worse before it gets better. 

By this point in the COVID pandemic, health officials had hoped the country would be turning a corner.