Risk of group aggregative behavior during COVID-19 outbreak: A case report

Figure 1 Chest computed tomography images showing multiple ground glass shadows in one or both lungs. A1: A 52-year-old woman from family A, showing bilateral subpleural (including interlobular pleura) distribution (mostly scattered) of small patchy ground glass density shadows; A2: A 37-year-old man from family A, showing the majority of the two lungs diverging in ground glass density shadows, being distributed in the outer zone. Some lesions, filled by air, were observed in bronchogram. Significant progress was seen 3 d later; B1: A 32-year-old woman from family B, showing multiple patchy and cord-like lesions scattered under the pleura of the lungs as well as some consolidated or ground glass density changes. The right pleura was slightly thickened and the left pleura was locally thickened; C1: A 42-year-old woman from family C, showing the middle lobe of the right upper lobe and tongue segment of the left upper lobe with multiple patchy density increasing shadows, mainly of ground glass appearance and with distribution under the chest.

Figure 2 Epidemiological investigations showing a group aggregative infection pattern. Green, yellow, and red colors represent a normal condition, a potential risk condition, and a risk condition, respectively. On January 19, 2020, three families, unknown to each other, dined at the same place. “Admitted” indicates individuals from each family who were in-hospital; “Diagnosed” indicates individuals from each family who were confirmed as having coronavirus disease 2019 by laboratory testing. A1, A2, A3, A4, and A5, B1, B2, and B3, and C1 indicate the members from family A, family B, and family C who experienced consecutive illness onset, respectively. Adm: Admitted; Diag: Diagnosed; NA: Negative; PO: Positive; Rest: Restaurant.