A survey conducted by the Indonesian government and researchers from the Faculty of Public Health (FKM), Universitas Indonesia (UI), revealed that 86.6% of the Indonesian population had developed immunity or antibodies to COVID-19 by the end of 2021.
The survey also noted that a higher proportion of the population in the productive age group possessed antibodies.
Antibodies were found in 92.1% of the population aged 12-18 years. This was followed by the 19-29 age group with 90.8% and the 30-59 age group with 89.9%.
Meanwhile, the percentage of the elderly population (over 60 years old) with COVID-19 antibodies was 83%. Children aged 1-11 years also generally had COVID-19 antibodies, with a percentage of 71.7%.
89.5% of women, both vaccinated and unvaccinated, were found to have COVID-19 antibodies. This percentage is higher than that of men, which was only 83.7%.
Regionally, the population in the Java-Bali region showed a higher percentage of COVID-19 antibodies at 91.3%, compared to those outside Java-Bali at 84.1%.
Among unvaccinated individuals, the proportion with COVID-19 antibodies was not significantly different between Java-Bali and outside Java-Bali, ranging from 73% to 74%.
This survey was conducted from November to December 2021, involving approximately 20,000 Indonesian residents across 100 regencies/cities.
The survey included individuals over one year old, regardless of their vaccination status (fully vaccinated, partially vaccinated, or unvaccinated).