Singapore last December became one of the first Asian countries to introduce coronavirus vaccines, beginning with health care workers.
The booster program is part of the effort to keep the critical numbers in check, alongside testing and safe distancing protocols.
Israel, France and other Western nations have already started administering or made plans for booster shots, citing indications that they are effective.
In July, Indonesia began giving booster shots to health workers, using Moderna vaccines donated by the U.S. through the WHO’s COVAX facility.
In China, booster shots are still under consideration, but authorities have placed border control and health care workers in a high-risk group considered prime candidates for extra shots.