Asymptomatic Subclinical Cases of Coronavirus Disease 2019 without Viral Transmission in Three Independent Families

Figures & data

Figure 1 Chest computed tomography performance of the indexes and contact tracing investigation of their contacts. (A and B) completely normal computed tomography of Case 1 and Case 2; (C) a slight single subpleural patch on the left side of Case 3 (yellow arrow); (D) contact tracing investigation of three clusters. The blue color indicates contacts living with indexes in the same apartment, eating together but sleeping in different rooms; the red color indicates persons with the closest contact with the indexes—living in the same apartment, eating together, and sleeping in the same rooms. None of the contacts were infected, according to their symptoms and the nucleic acid and serologic tests.

Table 1 Evaluation of COVID-19 Infection of Three Clusters

	Gender	Age	Relationship	Comorbidities	Clinical Presentations	CT Image	Detection of Swabs	Serological Tests^a (AU/mL)
								IgM	IgG
Index1	F	26		No	No	Normal	–	–	81.13
C1	F	46	Mother	No	No	NA	–	–	–
C2	M	48	Father	NPC	No	NA	–	–	–
C3	M	19	Brother	No	No	NA	–	–	–
Index2	F	30		No	Backache	Normal	–	–	106.05
C4	F	53	Mother	No	No	NA	–	–	–
C5	M	55	Father	No	No	NA	–	–	–
C6	M	32	Husband	No	No	NA	–	–	–
C7	M	4	Son	No	No	NA	–	–	–
Index3	F	36		No	Muscle soreness	Abnormal	–	–	79.02
C8	M	37	Husband	No	No	NA	–	–	–
C9	F	10	Daughter	No	No	NA	–	–	–
C10	M	3	Son	No	No	NA	–	–	–

Note: ^aCutoff value of positive antibody titers: ≥10 AU/mL.

Abbreviations: F, female; M, male; NPC, nasopharyngeal carcinoma; NA, not available.