All travelers who travel to Indonesia must have the Indonesia Health Alert Card in order to be able to complete security checks. The eHAC was created by the Indonesian Ministry of Health. It is used to track CO VID-19 acute cases entering and leaving the country. It is also useful for healthcare workers who work in areas with high risk of contracting measles, influenza, or any other type of chronic viral respiratory infection. These include parts of Borneo, Sumatra and the Philippines.