Acknowledgement 
All authors contributed equally. We would like to acknowledge the Director-General of Health, Ministry of Health Malaysia, Datuk Dr Noor Hisham Abdullah, the Director of Hospital Universiti Sains Malaysia, Profesor Dato’ Dr Ahmad Sukari Bin Halim, and Dato’ Dr Hjh Selasawati bt. Hj. Ghazali, the Director of Hospital Raja Perempuan Zainab II, for the support they have shown towards the publication of this report. To Dr Alia Rashid and Dr Ummuatiyah, medical officers at Severe Acute Respiratory Infection ward, Hospital Raja Perempuan Zainab II for the information that they have provided. To medical and house officers of paediatric haematooncology ward, Hospital University Sains Malaysia. To Mrs Nurul Azurah Mohd Roni and Mrs Noraida Hassan, the two librarians of Universiti Sains Malaysia who have assisted us on referencing and literature searching. Finally, the reported patient and his family members for the consent and cooperation they have given throughout the writing of this report.