Seroprevalence Survey: 86.6% of the Indonesian Population Possesses COVID-19 Antibodies

The Indonesian Ministry of Health, in collaboration with the Ministry of Home Affairs and the UI Faculty of Public Health (FKM) Pandemic Team, conducted a serological survey of the Indonesian population's antibodies against the SARS-CoV-2 virus. The results showed that a total of 86.6% of the Indonesian population had antibodies against COVID-19.

The survey was conducted from November to December 2021. This means that 86.6% of the Indonesian population possessed immunity against COVID-19 during that period.

In detail, the population who had received two doses of vaccination had a higher proportion of antibodies, namely 99.1% in November to December 2021. Meanwhile, the population who only received the first dose of vaccine had an antibody proportion of 93.1%.

The unvaccinated population had COVID-19 antibodies in 73.9% of cases. Furthermore, the group that had previously been detected with COVID-19 had a higher proportion of antibodies compared to those who had not.

The proportion of the population previously detected with COVID-19 and unvaccinated had antibodies at 88%. Meanwhile, the percentage for those who had never been detected was 73.6%.

Individuals who had received the first dose of the vaccine and had previously been detected with COVID-19 had antibodies at 96%, and 91% for those who had never been detected with COVID-19.

Those who had received the second dose of the vaccine and had previously been detected with COVID-19 had antibodies at 99.4%. Meanwhile, the figure was 73.6% for those who had never been detected with COVID-19. However, as vaccination continues, the number of people with immunity to COVID-19 will increase.

This survey was conducted on all Indonesian residents over the age of one year, with antibody categories for unvaccinated individuals, those with only one vaccine dose, and those with two vaccine doses. The survey involved samples from 100 regencies/cities with 20 primary samples and 60 reserve samples in each village/sub-district.