CNN  — 

The director of the National Institutes of Health said Thursday he’s concerned that vaccine “skepticism” could hinder the effort to immunize the country against Covid-19.

“I’m a bit concerned to see there’s a fair amount of skepticism in the American public about whether or not they would take such a vaccine,” Dr. Francis Collins told CNN in an interview. “We won’t get past Covid-19 unless we have a substantial majority of our public ultimately rendered immune.”

Some vaccine experts are concerned that President Trump’s chosen moniker for the vaccine development campaign – “Operation Warp Speed” – isn’t helping. They fear that name could leave the impression that speed is more important than safety.