US is 'losing time' in vaccination race as Delta variant becomes more pervasive, expert says

Covid-19 vaccination rates are down and cases are on the rise, exacerbated by the more transmissible Delta variant -- and an expert says the key to winning the race against the spread is getting more Americans vaccinated. 'We're losing time here. The Delta variant is spreading, people are dying, we can't actually just wait for things to get more rational,' Dr. Francis Collins, director of the National Institutes of Health told CNN Wednesday. Vaccines have been available to most Americans for months, but still only 48.2% of the country is fully vaccinated, according to the US Centers for Disease Control and Prevention -- and the rate of new vaccinations is on the decline.