A CORONAVIRUS vaccine in the US may only be taken by half of Americans due to growing concerns that the process to approve it will be rushed, a poll has revealed.

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President Donald Trump on Friday said the US will manufacture at least 100 million COVID-19 vaccine doses before the end of the year. But a new poll by Pew Research Group found that 77 percent of Americans are worried the vaccine will be distributed before its safety and effectiveness are fully tested.

The researched showed that only 51 percent of people in the US would be willing to take a vaccine if it was available today.

The eagerness to get a coronavirus vaccine has dramatically reduced by 21 percentage points from 72 percent in May.

The decrease was seen among Americans from all political parties in the US.

But Democrats and people who lean more towards Joe Biden’s party are 14 percentage points more likely to say they would get a vaccine than Republican supporters, according to the study.

Donald Trump speaking outside the White House

Donald Trump said the US will manufacture at least 100 million vaccine doses this year (Image: getty)

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Only half of Americans want to take a COVID-19 vaccine as concerns grow over its safety (Image: getty)

The research surveyed 10,093 American adults from 8 to 13 September.

The poll was conducted whilst UK based pharmaceutical company AstraZeneca said it was temporarily halting vaccine trials after a participant experienced a neurological side effect.

Among the Americans who said in the poll they would not take a vaccine, 76 percent said they are mainly concern about possible side effects.

The US Food and Drug Administration (FDA) said it could authorise a COVID-19 vaccine before the final trial phase is complete using an emergency approval.

The FDA said it would approve a coronavirus vaccine if it was safe and at least 50 percent effective in preventing the disease or decreasing the severity of the virus.

READ MORE: Flu jab 2020: How to tell if you have flu or coronavirus

Donald Trump speaking at press briefing in White House

Donald Trump criticised the director of the CDC who over the COVID-19 vaccine (Image: getty)

But Dr Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said researchers want a vaccine that is at least 75 percent effective.

This week, Mr Trump criticised the director of the Centres for Disease Control and Prevention (CDC) for claiming that a vaccine will not be widely available before the middle of next year.

Dr Robert Redfield, director of the CDC, blasted Mr Trump by saying face masks are “more guaranteed to protect me against COVID than when I take a COVID vaccine” in a testimony given to the US Senate Appropriations Committee on Wednesday.

In a press briefing, the president responded: “I think he made a mistake when he said that. It’s just incorrect information.

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Only 51 percent of people in the US would be willing to take a vaccine if it was available today (Image: getty)

“I believe he was confused. I think he just misunderstood the question, probably.”

Mr Trump has made the promise to deliver a vaccine this year central to his election campaign.

At a White House press briefing on Friday, he announced that a COVID-19 vaccine will be available for every American by April.

He said: “Hundreds of millions of doses will be available every month, and we expect to have enough vaccines for every American by April, and again I’ll say even at that later stage, the delivery will go as fast as it comes.”

But Dr Redfield said earlier this week that a vaccine will not be available until the autumn of next year.

Global coronavirus chart

Global coronavirus statistics (Image: Express.co.uk)

Speaking to the US Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, Dr Redfield said: “If you’re asking me when is it going to be generally available to the American public so we can begin to take advantage of vaccine to get back to our regular life, I think we’re probably looking at third … late second quarter, third quarter 2021.”

In the press briefing, Mr Trump claimed “massive amounts” of the vaccine “will be delivered through our great military, and the general is one of our best and he’s ready to go.”

He added: “We are again very advanced on the vaccine, we think that sometime in the very near future we’ll have it.

“We’re … I would say, I think I can say, years ahead of schedule what it would be if it were an administration other than this one.”