The recalled doses had been delivered to five European countries – Norway, Sweden, Spain, Portugal and Poland – in January, he said.
"Hence, people who have received Moderna jabs or are waiting for booster jabs do not have to worry about this issue," he wrote in a Blockdit post.
Chalermchai said Moderna recalled the doses because contamination was found in one vial, adding that the company did not clarify what was found in the vial.
"Moderna said the doses in question were made by its contracted manufacturer, Rovi, in Spain,” he said.
Rovi was also behind the recall of 1.63 million doses in Japan last September after 39 vials were found to be contaminated with stainless steel.
Chalermchai said the issue demonstrated the important role of manufacturers in safely delivering the vaccine.
He added that AstraZeneca vaccine manufactured by Thailand's Siam Bioscience has so far met safety standards with no reports of contamination.