Laboratory test Laboratory test results were compiled, including standard blood counts, blood biochemistry, C-reactive protein (CRP), procalcitonin (PCT), erythrocyte sedimentation rate(ESR), Interleukin-6 (IL-6) and myocardial enzyme spectrum. Additional data collected included medical imaging, treatment regimens, and prognosis (any severe complications, including death), and recover or discharge date (Table 1). Table 1. General information of the nine children infected by SARS-CoV-2 in Jinan. Case no. Gender Age Admit date Symptom Contact history Physical examination CT scan/X ray Changes in nucleic acids Prognosis The families with COVID Other people were infected 1 F 2y 9m 25 Jan No Father went to Wuhan on 24 Jan Negative Negative 7 Feb NT (−), 8 Feb NT (−), 23 Feb ST (+) Discharge on 9 Feb, Return on 23 Feb Father and grandma Father’s colleague 2 F 3y 7m 26 Jan Fever (37–37.6°C) Mather went to Wuhan (11–16 Jan) Negative Bronchitis 4 Feb NT (−), 5 Feb NT (+), 7 Feb NT (−), 8 Feb NT (−), 23 Feb ST (+) Discharge on 9 Feb, Return on 23 Feb Mother, father and grandma No 3 F 8y 1m 30 Jan Fever (38.5°C one time) Father took train many times (15–22 Jan) Negative Negative 7 Feb NT (−), 8 Feb NT (−), 23 Feb ST (+) Discharge on 9 Feb, Isolate at home Father Father’s three colleagues 4 M 3y 7m 01 Feb No Father transfer the flight in Wuhan on 14 Jan (stay 1 day) Negative Bronchopneumonia 7 Feb NT (+), 17 Feb NT (−), 18 Feb NT (−), 23 Feb ST (+) Discharge on 19 Feb, Return on 23 Feb Father and grandma No 5 F 5y 7m 02 Feb Mild, dry cough Mother (contacted a friend came from Hubei, 20–25 Jan) Negative Negative 2 Feb NT (+), 8 Feb NT (+), 12 Feb NT (−), 13 Feb NT (−). Recover Mather and father No 6 F 5y 2m 03 Feb No Father went to Wuhan (18–21 Jan) Negative Negative 3 Feb NT (+), 7 Feb NT (+), 17 Feb NT (−), 18 Feb NT (−) Recover Father No 7 M 11m 06 Feb No Parents work in Wuhan and went home on 22 Jan Negative Pulmonary consolidation and GGO 7 Feb NT (+), 13 Feb NT (+), 17 Feb NT (−), 18 Feb NT (−), 23 Feb ST (+) Discharge on 20 Feb, Return on 23 Feb Grandparents, Parents and brother No 8 M 11m 06 Feb No Parents work in Wuhan and went home on 22 Jan Negative Negative 7 Feb NT (+), 13 Feb NT (+), 17 Feb NT (−), 18 Feb NT (−), 23 Feb ST (+) Discharge on 20 Feb, Return on 23 Feb Grandparents, Parents and brother No 9 F 9y 10 Feb No Father (negative history) Negative bronchitis 9 Feb NT (+), 18 Feb NT (−). Recover Father No Note: NT, Nasal and throat swabs; SS, Sputum specimen (all the children no sputum); ST, stool; GGO, ground glass opacity.