Table 3.

Numbers of staff, patient, and visitor contacts traced from exposures to unexpected staff, patient, and visitor COVID-19 cases in the hospital from June 6, 2021, to October 9, 2021, as well as details of positive SARS-COV-2 PCR test results from surveillance swabs of these contacts

Unexpected COVID-19 cases	Staff contacts and PPE used during exposure to unexpected COVID-19 case				Close* patient contacts	Close* visitor contacts
	N95 (close)	N95 (transient)	Surgical mask (close)	Unprotected exposure (close)
Staff cases (n=135)	376	1459	170	160	355	28
Patient cases (n=43)	198	188	2	0	171	100
Visitor cases (n=15)	13	7	0	0	16	0
Total no. of contacts	587	1654	172	160	542	128
Positive SARS-CoV-2 results from swabs of contacts	4 staff contacts with detected SARS-CoV-2 PCR result1 unprotected, close*1 unprotected, transient†1 N95 mask, transient†1 surgical mask, transient†				0	0

^⁎Close contacts: Contacts who are exposed <2 minutes and ≥ 15 minutes to a positive COVID-19 case (during unexpected exposures to SARS-CoV-2 cases whereby there was an exposure to a COVID-19 staff, patient, or visitor within the hospital premises) and not in a full set of PPE (N95 mask or equivalent, gown/apron, gloves, eye protection).

^†Transient contacts: those who had potential exposure to a COVID-19 case (e.g. were in the ward at the same time as the case), but did not fulfill the criteria for close contact.

Abbreviations: PCR = polymerase chain reaction; PPE = personal protective equipment.