Nationwide distribution of a Covid-19 vaccine developed by Chinese firm Sinovac Biotech began yesterday in Indonesia.
Mass inoculations are scheduled to begin later this month.
The distribution exercise comes after state vaccine producer Bio Farma received 1.2 million doses of the vaccine on Dec 6 and 1.8 million doses last Thursday.
Bio Farma began distributing the Sinovac vaccine to health facilities across the country's 34 provinces yesterday, said the company's Covid-19 vaccination spokesman Bambang Heriyanto.
He added that the storage facilities necessary for keeping the vaccine doses have been prepared.
"All (vaccine) cold chain facilities at between 2 deg and 8 deg C are ready. Hopefully, that will help ensure the quality of the vaccines that will be used for the people," he told a press briefing.
Mr Bambang said Indonesia has carried out a number of national vaccination programmes in the past, so infrastructure would not be an issue.
Indonesia, currently struggling to control South-east Asia's worst coronavirus outbreak, plans to inoculate 181.5 million people aged 18 and above, or around 67 per cent of its nearly 270 million people, within 15 months.
The shots will first be given to its 1.3 million health workers, followed by another 17.4 million front-line workers. A total of 21.5 million people aged 60 and older will get the jab between this month and April.
In the second phase, scheduled to run from April this year to March next year, 63.9 million people in high-risk areas will get vaccinated, followed by the remaining 77.4 million of the targeted population.
Speaking at the same press briefing, the Health Ministry's Covid-19 vaccination spokesman, Dr Siti Nadia Tarmizi, said clinical trials of the Sinovac vaccine in Turkey and Brazil delivered "quite good" results, same as the ongoing third phase of the clinical trial in Indonesia.
The latter paved the way for the national vaccination programme to run as scheduled.
"We are quite optimistic that (the programme) will go in line with our schedule, and we can begin vaccinations in the second or third week of January 2021," Dr Nadia said.
Interim data from a late-stage trial in Turkey showed that the Sinovac vaccine is 91.2 per cent effective, while a similar trial in Brazil revealed that the shot was more than 50 per cent effective.
Indonesia's vaccination programme is subject to approval from Indonesian drug monitoring agency BPOM, which is set to grant emergency-use authorisation for the Sinovac vaccine to be used.
Dr Nadia said the programme will be carried out by around 2,500 hospitals, 13,000 health community centres and 49 port health authorities across the country. It will be supported by about 30,000 vaccinators.
Indonesia has so far secured nearly 330 million doses from five different suppliers, including Sinovac, AstraZeneca and Novavax, with the possibility of procuring millions more from them if needed.
The world's fourth-most populous nation has reported 765,350 Covid-19 infections and 22,734 deaths as at yesterday.
Its positivity rate - the proportion of tests that come back positive - is around 30 per cent, much higher than the World Health Organisation's recommended rate of 5 per cent or lower - a general benchmark for adequate testing.