Fig. 1From: Lower transmissibility of SARS-CoV-2 among asymptomatic cases: evidence from contact tracing data in Oslo, NorwayFlowchart of included index persons and close contacts. “Other exclusion criteria” includes index persons with more than 100 close contacts, index cases where all close contacts were missing in the population registry, or index cases where all close contacts had previously tested positive in the last 6 monthsBack to article page