Table I.

Nature of exposure among staff and patient close contacts in ward A

Type of contact	>15 min contact time (duration of contact if known, hours)	Activity performed (staff)/bed number at time of exposure (patient)	Patient on 8 L/min oxygen	PPE used during contact	SARS-CoV-2 test during surveillance period (day of testing from last exposure date∗)
Staff (Doctor)	Yes	History taking, chest auscultation	No	N95	None
Staff (Doctor)	Yes	Blood taking	No	Surgical mask	Yes (1)
Staff (Nurse)	Yes	Administration of medications	Yes	N95, goggles	Yes (1)
Staff (Nurse)	Yes	Obtained nasopharyngeal swab	Yes	N95, gloves, cap	Yes (1)
Staff (Nurse)	Yes	Escorted patient from general ward to airborne isolation ward (AIIR)	Yes	N95	Yes (1)
Staff (Nurse)	Yes	Nurse-in-charge for the affected cubicle	Yes	N95	Yes (1)
Staff (Nurse)	Yes	Escorted patient from general ward to AIIR	Yes	N95	Yes (1)
Patient	Yes (35)	01	Yes	Consistent use of surgical masks	Yes (1, 4, 8, 11, 13)
Patient	Yes (33)	51	Yes	—	Yes, (1, 13)
Patient	Yes (35)	03	Yes	—	Yes (1, 3, 13)
Patient	Yes (35)	04	Yes	Inconsistent use of surgical masks	Yes (1, 2, 4, 14)
Patient	Yes (35)	05	Yes	Consistent use of surgical masks	Yes (1, 14)
Patient	Yes (35)	06	Yes	—	Yes (1, 6, 9, 13)
Patient	Yes (35)	07	Yes	—	Yes (2, 4, 9, 11, 14)
Patient	Yes (35)	08	Yes	Inconsistent use of surgical masks	Yes (1, 2, 5, 7, 11, 13)
Patient	Yes (35)	41	Yes	Consistent use of surgical masks	Yes (13)
Patient	Yes (35)	42	Yes	Inconsistent use of surgical masks	Yes (14)

—, not available due to inability of patient to provide information on compliance of surgical mask wearing; AIIR, airborne infection isolation room; PPE, personal protective equipment.

^∗Last exposure date, i.e. Feb 3, 2020, was counted as day 0.