On Dec. 26, 2004, the U.S. Centers for Disease Control and Prevention (CDC) assisted with an earthquake measuring 9.2 on the Richter scale off the northwest coast of the island of Sumatra, Indonesia, and produced a tsunami that caused the deaths of an estimated 230,000 persons in India, Indonesia, the Maldives, Somalia, Sri Lanka, and Thailand.

A measles vaccination campaign targeted all children aged 6 months–15 years. Among eligible children aged 12–59 months, the percentage receiving measles vaccination ranged from 37.3% of IDPs in Aceh Besar to 58.2% of nondisplaced children in Banda Aceh.