In collaboration with the Indonesian ministries of development planning and health, UNICEF, and the World Health Organisation, Pulse Lab Jakarta filtered Twitter data regarding tweets about vaccines and immunization for perception trends, such as religious issues and disease outbreaks. Pulse Lab Jakarta's analysis focused on 88,368 tweets, filtered based on keywords and phrases related to immunisation. The study demonstrated how public health practitioners could use real-time insights gained from social media for situation awareness and rapid response, particularly to address the spread of rumours and misinformation.