Fig. D.1.

(Color Online) The epidemiological curve in Guangzhou (population 12.9 million), where restaurant X is located and where families B and C live. The symptom onset dates of all infected members of families A, B, and C are also shown. By January 24, when A1 had the first symptoms, there were 72 symptomatic cases (15 local and 59 imported); by January 27, when C1 had the first symptoms, there were 202 symptomatic cases (52 local and 150 imported); and by Feb 1, when B1 had the first symptoms, there were 296 symptomatic cases (83 local and 213 imported). With close contact tracing, families B and C did not have contact with any of the identified cases and/or any visitors from Hubei Province 14 days prior to the onset of their symptoms.