SOFIA (AFP) - It is getting close to lunchtime and a Covid-19 vaccination centre in the Bulgarian capital, Sofia, is almost empty, a vivid example of the way the country's immunisation effort is hamstrung by fake news and widespread mistrust.

As a fourth coronavirus wave threatens, official data shows that only 15 per cent of the population of 6.9 million people has been fully vaccinated, far below the European Union average of 53.3 per cent.

"Ever since the start of vaccinations we have been lagging last," Health Minister Stoycho Katsarov said in a recent interview.

On the streets of Sofia, it is easy to spot the attitudes that have led to the low uptake.

"Absolutely not," replies 45-year-old construction worker Georgy Dragoev, when asked by AFP if he would get vaccinated.

"I think that they're just spreading panic," he says, while taking his lunch break on a bench outside the vaccination centre.

"If this coronavirus exists and I catch it, I will somehow manage to beat it," he adds.

A recent Gallup poll showed that a total of 41.8 per cent of Bulgarians said they did not plan to get jabbed.

Even some of those who came to get vaccinated have had their reservations.

Accountant Katerina Nikolova, 39, told AFP that it "was not an easy decision" for her, saying the expedited clinical trial procedure for the Covid-19 vaccines worried her.

Outright fake news about the virus has also played a role. Since mid-March, AFP has been running a fact-checking service in Bulgarian, and in that period, half the articles published have been related to coronavirus disinformation.

The theories range from the claim that the vaccine leaves magnetic chips implanted in people's arms - shared thousands of times on Facebook - to pictures of French football fans' victory celebrations after the 2018 World Cup being falsely presented as being from protests against France's "health pass".

Health Minister Katsarov has partly blamed Bulgarians' "susceptibility to conspiracy theories" for the low vaccine uptake, but Ms Nikolova said she was also confused by the conflicting views of experts invited on TV.

Such guests are often asked to comment on areas outside their expertise or are allowed to present scientifically dubious opinions.

One of the voices invited to contribute to television debates, Dr Atanas Mangarov, is an infectious diseases associate professor and the head of the Covid-19 care unit at a Sofia hospital, but has spread discredited theories on the virus, insisting mask-wearing and vaccines are not necessary and promoting herbal teas as a treatment.

Media expert Nelly Ognyanova says that the media have contributed to the poor standard of information. "The media, the social networks, the public appearances of experts and other sources carry shared responsibility for anti-vaxxer sentiment and for mistrust about the role and safety of vaccines," she said.

"It is not a secret that this is also part of a hybrid war led by the Kremlin," she added, referring to the role of Russian troll factories in spreading disinformation - in a country which has long enjoyed close cultural links to Russia.

According to Gallup International's Parvan Simeonov, the scepticism towards vaccines also reflects Bulgarians' "resentment towards elites" and broader mistrust of the authorities and official information.

According to official data, Bulgaria has registered just under 430,000 cases of Covid-19, but experts and the health authorities agree that this is definitely an undercount as access to free tests is limited and many sick people simply did not pay to get a test. Mr Simeonov says vaccine uptake has further been slowed by the sheer number of people who have already been infected - or believe they have - and who have therefore delayed their jabs in accordance with medical advice.

However, as a fourth wave of infections looms, Mr Simeonov said "the fear factor" could bring a change in attitudes in the months ahead, driving vaccinations.

If the population remains hesitant, experts are worried it could lead to Bulgaria's coronavirus mortality rate - already one of the highest in the EU at 263 per 100,000 inhabitants - spiking yet further.