Malaysia has said it is investigating allegations that some recipients of the AstraZeneca Covid-19 vaccine were not injected with the correct dosage, Reuters reports.

At least two recipients have said in recent days that they were given less than the required amount, posting videos on social media of the jab being administered to support their claim.

The health ministry did not say whether the recipients of the vaccines were under-dosed, but said it took serious note of the allegations and announced new rules for medical personnel administering the jab.