New polls in the US, Germany and the Czech Republic - among others - found that 50 per cent were sceptical.
Up to half of the populations in countries including the United States, Germany and the Czech Republic say they may not get any new coronavirus vaccine that is developed.
A vaccine against the deadly virus that has swept the globe over the last six months is seen as possibly the only way for the world to return to normal after the pandemic, and scientists in hundreds of different countries are working as fast as they can to try to produce one.
However, experts have estimated that at least 70 per cent of people will have to get the vaccine in order for it to stop coronavirus, a figure that appears to be some way off based on the latest numbers.
Professor Heidi Larson, anthropologist and director of the Vaccine Confidence Project at the London School of Hygiene and Tropical Medicine, said: "It's going to be a challenge, particularly because in general, populations are more anxious about new vaccines and that's understandable.
"But the good news is we do have time before we, hopefully, get a vaccine, so I think that we have to use that."
In the United States, a number of polls have shown that only around 50 per cent are committed to getting a coronavirus vaccine...
This week, the country's leading public health expert Dr Anthony Fauci told CNN he believed that the US was "unlikely" to reach herd immunity as a result of this, inspired by the "general anti-science, anti-authority, anti-vaccine feeling".
In Germany, a poll this week by YouGov found that only one in two Germans would definitely get vaccinated if there was a jab available, and one in five said they definitely would not. A protest was held in Ukraine on Friday over the potential for compulsory coronavirus vaccinations...