He said this development is particularly concerning with Malaysia still recording a high number of daily infections and with most economy sectors having resumed full operations.
Malaysia has fully vaccinated 58.
Amirudin added that the vaccinations had a three-year shelf life and would be used up inside the state or sold to other states and countries.
He said, the booster dose appointment date for eligible individuals would be given through the MySejahtera application.
It was then expanded to those who more than 3 months ago, on 22 October 2021.
There were differences in the demographics of the recipients of the three vaccines and it could have resulted in the different results, Kalaiarasu said.