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Article

Containment, Contact Tracing and Asymptomatic Transmission of Novel Coronavirus Disease (COVID-19): A Modelling Study

1
Kyoto University School of Public Health, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
2
Graduate School of Medicine, Hokkaido University, Kita 15 Jo Nishi 7 Chome, Kita-ku, Sapporo-shi, Hokkaido 060-8638, Japan
3
Osaka Institute of Public Health, Nakamichi 1-3-69, Higashinari, Osaka 537-0025, Japan
4
CREST, Japan Science and Technology Agency, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
*
Author to whom correspondence should be addressed.
J. Clin. Med. 2020, 9(10), 3125; https://doi.org/10.3390/jcm9103125
Received: 8 August 2020 / Revised: 23 September 2020 / Accepted: 24 September 2020 / Published: 27 September 2020
When a novel infectious disease emerges, enhanced contact tracing and isolation are implemented to prevent a major epidemic, and indeed, they have been successful for the control of severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS), which have been greatly reduced without causing a global pandemic. Considering that asymptomatic and pre-symptomatic infections are substantial for the novel coronavirus disease (COVID-19), the feasibility of preventing the major epidemic has been questioned. Using a two-type branching process model, the present study assesses the feasibility of containing COVID-19 by computing the probability of a major epidemic. We show that if there is a substantial number of asymptomatic transmissions, cutting chains of transmission by means of contact tracing and case isolation would be very challenging without additional interventions, and in particular, untraced cases contribute to lowering the feasibility of containment. Even if isolation of symptomatic cases is conducted swiftly after symptom onset, only secondary transmissions after the symptom onset can be prevented. View Full-Text
Keywords: epidemiology; containment; asymptomatic; emerging infectious diseases epidemiology; containment; asymptomatic; emerging infectious diseases
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MDPI and ACS Style

Kinoshita, R.; Anzai, A.; Jung, S.-m.; Linton, N.M.; Miyama, T.; Kobayashi, T.; Hayashi, K.; Suzuki, A.; Yang, Y.; Akhmetzhanov, A.R.; Nishiura, H. Containment, Contact Tracing and Asymptomatic Transmission of Novel Coronavirus Disease (COVID-19): A Modelling Study. J. Clin. Med. 2020, 9, 3125. https://doi.org/10.3390/jcm9103125

AMA Style

Kinoshita R, Anzai A, Jung S-m, Linton NM, Miyama T, Kobayashi T, Hayashi K, Suzuki A, Yang Y, Akhmetzhanov AR, Nishiura H. Containment, Contact Tracing and Asymptomatic Transmission of Novel Coronavirus Disease (COVID-19): A Modelling Study. Journal of Clinical Medicine. 2020; 9(10):3125. https://doi.org/10.3390/jcm9103125

Chicago/Turabian Style

Kinoshita, Ryo, Asami Anzai, Sung-mok Jung, Natalie M. Linton, Takeshi Miyama, Tetsuro Kobayashi, Katsuma Hayashi, Ayako Suzuki, Yichi Yang, Andrei R. Akhmetzhanov, and Hiroshi Nishiura. 2020. "Containment, Contact Tracing and Asymptomatic Transmission of Novel Coronavirus Disease (COVID-19): A Modelling Study" Journal of Clinical Medicine 9, no. 10: 3125. https://doi.org/10.3390/jcm9103125

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