Nosocomial infection and spread of SARS-CoV-2 infection among hospital staff, patients and caregivers

Table 1 Distribution of cases of severe acute respiratory syndrome coronavirus 2 nosocomial infection in index cases and secondary cases infected by the index cases, n (%)

	Index case				Secondary cases
	n	Hospital staff1	Other contacts2	P value	Average No. of infections per index No. (n = 97)	Hospital staff	Caregivers3	Patients
Cluster	12	3 (25)	9 (75)	< 0.001	8.08	29 (30)	24 (25)	44 (45)
Sporadic infection	23	21 (91%)	2 (9)

¹Hospital staff: physicians, nurses, other healthcare workers, and other staff members.

²Other contacts: including the patient’s family members (n = 1), private caregivers (n = 3), and patients (n = 5) in index number of cluster. Including the private caregiver (n = 1) and the patient (n = 1) in sporadic.

³Caregivers included the patient family members (n = 15) and private caregivers (n = 9).

Table 2 Comparison of clusters of severe acute respiratory syndrome coronavirus 2 infection among hospital staff and private caregivers, n (%)

	n (%)	Physicians	P value	Nurses	P value	Other hospital staff1	P value	Private caregivers	P value
Cluster2	42 (63.6)	5 (11.9)	0.650	6 (14.3)	0.069	19 (45.2)	0.485	12 (28.6)	0.016
Sporadic	24 (36.4)	2 (8.3)		8 (33.3)		13 (54.2)		1 (4.2)

¹Other hospital staff: other than physicians and nurses.

²Cluster: Including 3 hospital staff and 3 private caregivers in the index case, and 29 hospital staff and 9 private caregivers who were infected by the index case.