But experts say two barriers stand in the way of reaching herd immunity and getting back to life as we knew it -- Covid-19 variants and vaccine hesitancy. More than 22% of the US population -- 75 million people -- have received at least one dose of vaccine, according to the Centers for Disease Control and Prevention. States juggle expanding vaccine access and ending capacity rulesWith an increase in supply, more states have expanded eligibility for the vaccines. "What the CDC really needs to do at this point is to say for unvaccinated people, here are the activities that are low risk, medium risk and high risk. "I think that type of benefit of vaccination really needs to be illustrated to people."

Source: CNN March 19, 2021 07:54 UTC