Timeliness of Contact Tracing Among Flight Passengers in Vietnam
Explore the timeliness of contact tracing among flight passengers during the COVID-19 epidemic in Vietnam. Learn about the factors influencing contact tracing effectiveness and the procedures followed for containing transmission. This study aims to assess the timeliness of contact tracing on flights with COVID-19 cases in Vietnam and examine associated factors.
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Presentation Transcript
Timeliness of contact tracing among flight passengers during the COVID-19 epidemic in Vietnam the South East Asia and Western Pacific Bi-regional FETP Videoconference, 7 - 8 September 2021 Hoang Thi Ngoc-Anh Master of Applied Epidemiology Scholar, Research School of Population Health, Australian National University, Canberra, ACT, Australia Department of Communicable Disease Control, National Institute of Hygiene and Epidemiology, Vietnam
Section A: Background What s known What s new Timeliness on contact tracing among aircraft passengers? International air travels spread COVID-19 Factors influencing timeliness? Increase cases among returning nationals and tourists in Vietnam Contact tracing contribute to the containment of transmission Timeliness - a key for effective contact tracing 2
Section A: Aims of this study Assess timeliness of contact tracing among passengers on flights with COVID-19 cases on board in March 2020 in Vietnam Explore factors associated with timeliness of contact tracing 3
Figure. Procedure of contact tracing for flights with COVID-19 infected cases in Vietnam
MARCH MARCH 2020 2020 JANUARY JANUARY 2020 2020 12 Mar: Travel restriction from 8 European countries 14-day mandatory quarantined & tested for SARS-CoV-2 for passengers from 8 European countries. 1 Jan: Limited travel to and from Wuhan 14-day mandatory quarantined & tested for SARS-CoV-2 for passengers travel to Wuhan and have COVID-19 compatible symptoms. 1 Mar: Travel restriction from Iran 14-day mandatory quarantined & tested for SARS-CoV-2 for passengers from Iran. 18 Mar: Travel restriction from the United Stated, Southeast Asian countries and Russia 14-day mandatory quarantined & tested for SARS-CoV-2 for passengers from the United Stated, Southeast countries and Russia. 2 Mar: Travel restriction from Italy 14-day mandatory quarantined & tested for SARS-CoV-2 for passengers from Italy. 14 Mar: Travel restriction from the UK & 26 Schengen countries 14-day mandatory quarantined & tested for SARS-CoV-2 for passengers from the UK & 26 Schengen countries. 25 Jan: Halted flights to and from Wuhan All flights from and to Wuhan, Hubei were halted indefinitely. Asian 21 Mar: Compulsory quarantine & test all inbound passengers 14-day mandatory quarantined & tested for SARS-CoV-2 for all inbound irrespective of origin. 7 Mar: Compulsory health declaration & mandatory face masks Compulsory health declaration for all inbound passengers irrespective of origin. All passengers must wear masks at immigration points. 15 Mar: Backward tracing passengers from 8 March All passengers who arrived to Vietnam from onwards were required 14-day mandatory quarantined & tested for SARS-CoV-2. FEBRUARY FEBRUARY 2020 2020 passengers 8 March 28 Mar: All international flights from and to Vietnam halted 28 Feb: Travel restriction from South Korea
Section B: Methods Where data we collected: The national COVID-19 Contact Tracing Management System Civil Aviation Administration (flight manifest and passenger detail) Interval II Interval I Index case confirmation Contact tracing completion Contact tracing initiation 6
Section C: Results 2228 passengers from 22 flights were prospectively traced 1785 (80.1%) passengers were successfully traced 27 (1.2%) passengers were lost-to-follow-up 25 (1.1%) passengers were index cases 391 (17.6%) passengers already exited the country Figure. Number of passengers needing to be traced, successfully traced, and not yet successfully traced each day 7
Section C: Results >50% not yet reached during high workload days Figure. Number of passengers needing to be traced, successfully traced, and not yet successfully traced each day
Section C: Results The number of passengers needed to be traced reduced rapidly during the first two days Figure. The cumulative probability of unsuccessful tracing for 1,812 passengers on 22 flights during March 2020 9
Section C: Results Index case confirmation Contact tracing initiation Contact tracing completion + Total = Interval I Interval II 4.5 (IQR: 4-6) 1 (IQR: 1-2) 3 (IQR: 2-5) Overall: Methods of index case detection 5 (IQR: 4-7) 1 (IQR: 1-2) 7 (IQR: 5-8) Self-presentation: 4 (IQR: 3-5) 2 (IQR: 1-2) 2 (IQR: 2-3) Mandatory testing: 10
Section C: Results Tracing time: Mandatory testing < Self-presentation Vietnamese < Non-Vietnamese Small planes < Large planes 11
Section D: Conclusions Contact tracing was timely overall, but delayed if index case was detected by self-presentation Delays on high workload days Mandatory SARS-COV-2 testing at arrival should be considered 12
Acknowledgement Dr. Florian Vogt, Australian National University Dr. Thai Quang Pham, NIHE Ms. Ha-Linh Quach, ANU ASEAN-Australia Health Security Fellowship Program, Commonwealth Department of Foreign Affairs and Trade Vietnam National Steering Committee for COVID-19 Prevention and Control 14
