Clinics in the public and private sectors are responsible for vaccinations and are providing booster shots now.
Lau said the government should not blame the contractors since the tender board had examined and assessed their capacities before awarding the project.
The phase 2 trial included 2878 participants, all of whom were in good health at the time they were recruited from June 1-June 30, 2021.
Doctors in Johor and Sarawak have reported that a sizeable chunk of their patients who received Sinovac are refusing the Pfizer booster shot.
 He added that the government would also seek the opinion and suggestions of the Health Ministry based on its risk assessments.
Waiting times may vary as the queue is prioritised for individuals with appointments.