Thailand said on Wednesday it would import nearly four million doses of Moderna's mRNA coronavirus vaccine towards the end of this year and a further one million in early 2022, for use by private hospitals, Reuters reports.

Thailand's vaccinations strategy so far has relied heavily on the viral vector vaccine developed by Oxford University and AstraZeneca and Sinovac Biotech's inactivated Covid-19 vaccine.

The Government Pharmaceutical Organization in a statement said 3.9 million doses of the Moderna vaccine would be delivered in the fourth quarter and 1.1 million doses in the first quarter of 2022.

The announcement comes as the Infectious Disease Association of Thailand (IDAT) urged Prime Minister Prayuth Chan-ocha to secure more mRNA vaccines to better contain the outbreak.

“The vaccine procurement plan of 150 million doses has a high proportion of Sinovac,” the association said in a letter to Prayuth, citing that mRNA vaccines had a higher efficacy rate than that of Sinovac.