Table 1.

Demographics, Epidemiology Investigations and Number of Potentially Exposed Patients and Healthcare Workers (HCWs), Among Confirmed COVID-19 Cases in HCWs at an Acute- and Tertiary-Care Hospital During an Outbreak of SARS-CoV-2 (N=14)

Case No.	Demographics and Occupation	Febrile Prior to Detection of Illness	Imported Case vs. Locally Transmitted Case	Epidemiology Linkage	Attended Staff Clinic or ED	Returned to Work After Symptom Onset/Prior to Symptom Resolution	No. of HCWs Who Came Into Contact With Cases	No. of HCW With Significant Unprotected Contact Requiring Quarantine	No. of Patients Who Came Into Contact With Cases	No. of Patients With Significant Unprotected Contact Requiring Quarantine
1a	26 yo woman, medical social worker	Afebrile	Local transmission	Linked	Yes	Yes (prior to resolution)	86	48	8	0
2a	31 yo woman, medical social worker	Afebrile	Local transmission		Yes	No	11	11	2	0
3	32 yo woman, psychologist	Febrile	Imported case	Contact with community COVID-19 case	Yes	Yes (after symptom onset)	4	1	1	1
4b	58 yo man, doctor	Afebrile	Imported case	Linked	Yes	No	1	0	4	0
5b	55 yo woman, researcher	Afebrile	Imported case		No, directly admitted in view of contact	No	0	0	0	0
6	29 yo woman, researcher	Afebrile	Local transmission	Unlinked	Yes	No	7	2	0	0
7	37 yo woman, nurse	Afebrile	Imported case	Unlinked	Yes	Yes (after symptom onset)	5	2	0	0
8	22 yo woman, nurse	Afebrile	Local transmission	Family cluster; transmission outside of hospital	No, admitted to another institution (with family)	No	0	0	0	0
9	27 yo woman, administrative staff	Afebrile	Local transmission	Unlinked	Yes	Yes(after symptom onset)	7	3	0	0
10	22 yo woman, nurse	Afebrile	Local transmission	Family cluster; transmission outside of hospital	No, admitted to another institution (with family)	No	5	5	3	0
11c	28 yo man, cleaner	Febrile	Local transmission	Linked	No, tested at another institution	Yes (after symptom onset)	1	1	0	0
12c	27 yo man, cleaner	Febrile	Local transmission		Yes	Yes (after symptom onset)	1	1	0	0
13d	27 yo man, cleaner	Afebrile	Local transmission	Linked	Yes	Yes (prior to resolution)	1	1	0	0
14d	36 yo man, cleaner	Febrile	Local transmission		No, directly admitted in view of contact	Yes (after symptom onset)	1	1	0	0

Note. ED, emergency department.

=Linked case, with intra-hospital transmission.

=Linked case, with intra-hospital transmission in a non-clinical area.

^aStaff cluster with likely intrahospital transmission in a nonclinical area: shared an office, did not have contact outside of work.

^bStaff cluster with transmission outside the hospital. Cases 4 and 5 were part of a family cluster of imported cases (N=3), who tested positive after returning from overseas.

^cStaff cluster with transmission outside the hospital. Cases 11 and 12 originally stayed in different rooms of a dormitory that was a known COVID-19 cluster. They were initially asymptomatic, so they were moved into shared temporary accomodation (a room with an attached toilet). Cases 11 and 12 went to work separately and worked in different blocks of the hospital; they had no contact while at work.

^dStaff cluster with transmission outside the hospital. Cases 13 and 14 originally stayed in different rooms of a dormitory that was a known COVID-19 cluster. They were initially asymptomatic, so they were moved into shared temporary accomodation (a room with an attached toilet). Cases 13 and 14 went to work separately and worked in different blocks of the hospital; they had no contact while at work.