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WASHINGTON–Pfizer, Moderna, and AstraZeneca all say they have a coronavirus vaccine that is showing a high level of safety and effectiveness, but some Americans remain skeptical.

A new Gallup poll finds that 58% of Americans said they would get vaccinated against the coronavirus if there was an FDA-approved vaccine available right now at no cost. U.S. Surgeon General Jerome Adams, formerly Indiana’s health commissioner, is concerned about the 42% who are not convinced.

“What I’d hate is to have a vaccine that could end this pandemic, but people don’t trust it,” said Adams in an interview with ABC’s Good Morning America Monday. “I’ll keep working with any organization to help people understand the safety of this process, not just the speed.”

Adams said when he is told that he can get the vaccine, he will get it to protect himself, his family, and the community.

“We have not cut any safety corners. Normal studies only have about 5,000 people in them before a vaccine is approved. These studies have 30,000 to 60,000. These vaccines, at the point of being administered to the American public, will have more data than any other vaccine developed in history,” said Adams.

Adams said some vaccines will require two shots, but that doesn’t diminish the effectiveness or the safety of it.

“I’m just excited that we now have three vaccines out there because when you’re trying to immunize the entire planet, we want to have as many different tools in our arsenal as possible,” said Adams.

AstraZeneca and the University of Oxford are in late-stage trials of developing a coronavirus vaccine. On Monday, researchers claimed the new vaccine prevented 70% of people from developing the virus. The head researcher said those who were given a half dose followed by a full dose were about 90% protected.

Last week, drugmakers Pfizer and Moderna reported preliminary results showing their coronavirus vaccines were about 95% effective.