A leaked health ministry document has prompted calls in Thailand for medical staff inoculated against Covid-19 to be given a booster of an mRNA vaccine, after it included a comment that such a move could dent public confidence in Sinovac Biotech's vaccine.

The internal memo, which included various opinions, was reported by local media and shared widely on social media. It was confirmed by Thai Health Minister Anutin Charnvirakul as being authentic.