The government has been urged not to capitalise politically on the disrupted vaccine rollout which has forced the programme to be suspended at many hospitals in Bangkok.
Boonyu Korpornprasert, director of the mass communication programme at Krirk University, said the allocation of vaccines to elderly people and those suffering underlying diseases had been "messed up" from the outset.
Information about the campaign had come from several sources and confused people, he said, and should have been driven by a single authority reliant on a central data system.
Mr Boonyu said when the same information was passed on by different sources, there was a danger people would suspect there was a political motive behind the vaccine distribution and supplies might have been diverted to specific ministries to score political points.
Prime Minister Prayut Chan-o-cha should have dealt with the issue himself instead of letting ministries dictate their own rules, he said.
His comments came after the Public Health Ministry announced that the elderly and individuals with underlying medical conditions in Bangkok whose Covid-19 vaccinations had been delayed could now get their shots at the vaccination centre at Bang Sue Grand Station.
Shortly after the ministry announced this new vaccination option, several people vented their frustration on social media.
"This isn't a good way of managing the vaccination programme. We've been registered to be vaccinated at hospitals close to our homes for a month and now we have to travel all the way to Bang Sue?" one complainant posted.