This comes after a video circulated online that showed a healthcare worker at a drive-through vaccination centre in Sungai Petani failing to depress the syringe when administering a jab.

Khairy said this was an isolated incident and that disciplinary action was being taken against the health worker, who he said was exhausted at the time.

He said “human negligence” or misunderstanding involving a small number of cases should not tarnish the hard work and tireless efforts being put in by the nation’s healthcare workers to implement the vaccination programme.

“I would like to urge the public to understand the context of these (incidents) and ensure that we preserve the integrity of the national Covid-19 immunisation programme and also the integrity of the thousands of nurses, doctors and frontliners vaccinating at a rate of half a million a day.

“I take every single complaint from the public seriously, and I don’t want to downplay this, because even if there is one single error, that is one too much.”

Khairy also sought to dispel allegations that the incidents pointed to a vaccine selling cartel, adding that police were unable to find any such criminal ties.

“I would like to categorically say today, that those cases that have reported empty vaccinations have nothing to do, and are not linked, to any vaccine selling syndicate.”

He said the majority of the reports were proven false or inconclusive, and gave the example that some complaints came from people who did not feel any side effects and concluded that they had not been given a vaccine.

People may now take videos or photos of the vaccination process, he said, which was previously barred at some centres, as a way to ensure doses are administered properly.

“Go and film yourself or take a video so that you have hard proof, and we also have hard proof, that you’ve received a proper dosage for your vaccination.”