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Awareness of cardiac involvement in dengue infection has potentially valuable management implications. To determine the prevalence of myocarditis in dengue severity, we conducted prospective study of paediatric dengue illness at Dr. Sardjito General Hospital, a tertiary hospital in Yogyakarta, Indonesia, from period of July 2015 to May 2016. World Health Organization (WHO) Dengue Guideline 2011 classification system was used. Diagnosis of dengue infection was made based on either by dengue serology and/or NS1 test. Myocarditis was assessed based on elevation of cardiac enzymes, as creatine kinase (CK), creatine kinase-MB (CK-MB), Troponin I (TnI) and by electrocardiography (ECG). Proportion between groups was compared using the Fisher's exact test. We analysed 50 children with diagnosis of dengue fever (DF), 12 of dengue haemorrhagic fever (DHF) and 23 of dengue shock syndrome (DSS). Myocarditis diagnosed in 53%, 75% and 96% of DF, DHF and DSS, respectively. We found that myocarditis was more prevalent significantly in DSS than DF (p = 0.003)., (© The Author(s) [2019]. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oup.com.)