The University of Hong Kong - State Key Laboratory of Emerging Infectious Diseases, Government of the Hong Kong Special Administrative Region - Hospital Authority, The University of Hong Kong - Queen Mary Hospital, affiliation not provided to SSRN, The University of Hong Kong, affiliation not provided to SSRN, The University of Hong Kong - Department of Microbiology, The University of Hong Kong - State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong - State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong - State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong - State Key Laboratory of Emerging Infectious Diseases, affiliation not provided to SSRN, affiliation not provided to SSRN, Princess Margaret Hospital - Department of Paediatric and Adolescent Medicine, affiliation not provided to SSRN, The University of Hong Kong - State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong - Department of Mechanical Engineering and The University of Hong Kong - State Key Laboratory of Emerging Infectious Diseases