More than 4.2 million people have been inoculated since Dec. 14 with one of two vaccines, far short of the Trump administration's goal of 20 million by the end of 2020.
First nurse to receive Pfizer vaccine gets booster shot
"I know that we're not out of the woods yet, we don't have that herd immunity yet, but the burden feels definitely much lighter today," Lindsay said.
![Reuters logo](/images/reuters.jpg)