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Transmissibility of asymptomatic COVID-19: Data from Japanese clusters.
Nakajo, Ko; Nishiura, Hiroshi.
  • Nakajo K; Hokkaido University, Sapporo 0608638, Japan.
  • Nishiura H; Kyoto University School of Public Health, Kyoto 6018503, Japan. Electronic address: nishiura.hiroshi.5r@kyoto-u.ac.jp.
Int J Infect Dis ; 105: 236-238, 2021 Apr.
Article in English | MEDLINE | ID: covidwho-1093059
ABSTRACT

BACKGROUND:

The epidemiological importance of asymptomatic individuals who would never develop illness, compared to those who eventually develop symptoms, has yet to be fully clarified.

METHODS:

The very first cluster data in Tokyo and Kanagawa (n = 36) were analyzed. Movement of all close contact was restricted for 14 days and they underwent laboratory testing with polymerase chain reaction. The reproduction numbers of symptomatic and asymptomatic cases were estimated.

RESULTS:

The reproduction number for symptomatic cases was estimated to be 1.2 (95% confidence interval (CI) 0.5-2.9). The relative infectiousness of asymptomatically infected cases was estimated to be 0.27 (95% CI 0.03-0.81) of symptomatic cases.

CONCLUSION:

The relative transmissibility of asymptomatic cases is limited. Observing clusters starting with symptomatic transmission might be sufficient for the control.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Asymptomatic Infections / SARS-CoV-2 / COVID-19 Type of study: Observational study Limits: Female / Humans / Male / Middle aged Country/Region as subject: Asia Language: English Journal: Int J Infect Dis Journal subject: Communicable Diseases Year: 2021 Document Type: Article Affiliation country: J.ijid.2021.02.065

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Asymptomatic Infections / SARS-CoV-2 / COVID-19 Type of study: Observational study Limits: Female / Humans / Male / Middle aged Country/Region as subject: Asia Language: English Journal: Int J Infect Dis Journal subject: Communicable Diseases Year: 2021 Document Type: Article Affiliation country: J.ijid.2021.02.065