Since 2022, Indonesia has seen an increase in suspected and confirmed measles cases compared to previous years. Between 1 January and 3 April 2023, a total of 2,161 suspected measles cases (848 laboratory-confirmed and 1,313 clinically compatible [suspected]) were reported in 18 of Indonesia’s 38 provinces.
The current outbreak is characterized by suboptimal population immunity, including children without Measles vaccination. Supplemental Immunization Activity (SIA) was conducted in 2022, targeting children <15 years old in high-risk provinces (Aceh, North Sumatera, Riau, Riau Islands, and West Sumatera), 9–59 months old in provinces in Java-Bali, and 9 months to 12 years old in the remaining provinces, with efforts to strengthen routine immunization and catch-up activities ongoing to address the population immunity gaps.
