Table 3 Summary of transmission profiles of asymptomatic cases in contact tracing studies
From: Exploring secondary SARS-CoV-2 transmission from asymptomatic cases using contact tracing data
Study | Setting | Sample size | Measurement of relative infectivity of asymptomatic cases |
|---|---|---|---|
He et al. [15] | Ningbo city, China | 52 asymptomatic and 271 symptomatic cases | Ratio of reproduction numbers: 0.26b |
Nakajo et al. [16] | Tokyo and Kanagawa, Japan | 12 asymptomatic and 24 symptomatic cases | Ratio of reproduction numbers: 0.27 (95% CI: 0.03–0.81) |
Sayampanathan et al. [13] | Singapore | 3035 contacts of asymptomatic cases and 755 contacts of symptomatic cases | Incidence rate ratio: 0.26b |
Chaw et al. [14] | Brunei | 106 contacts of asymptomatic cases and 1595 contacts of symptomatic casesa | Attack rate ratio: 1.12c |