Acknowledgements
This study was approved by the Medical Review and Ethical Committee from National Institute of Health, Ministry of Health Malaysia (NMRR-20-2862-57870). The authors would like to thank the Director General of Health Malaysia for allowing us to use the secondary data from CDCIS e-Notifikasi online registry and SIMKA Outbreak system. Our gratitude also goes to public health medicine specialists, medical officers and staffs at Dungun District Health Office and Terengganu State Health Department for their assistance during data collection.
Disclosure statement
The authors have no conflicts of interest.