Table 1

Analysis of COVID-19 cases confirmed by nasopharyngeal swab (NPS) after symptom onset

Case	Hospital	Total endoscopy activity (cases)	Procedure	Days from endoscopy to symptom onset	Cause identified on review	Attributed to endoscopy?
1	A	440	Colonoscopy	12	Attended for CT scan on day 5 after endoscopy (non-swab)	No
2	B	458	OGD	7	No other likely source identified	Yes
3	B	458	Colonoscopy	5	Attended emergency department on day prior to endoscopy	No
4	C	263	Colonoscopy	6	No other likely source identified	Yes
5			Colonoscopy	3	Family member with confirmed infection prior to attendance*	No
6			Sigmoidoscopy	2	Multiple family members with confirmed infection†	No
7			Colonoscopy	4	Attended for CT scan 3 days prior to endoscopy (non-swab)	No
8	D	462	ERCP	5	Temporary admission to ward where outbreak occurred	No
9			Colonoscopy	2	Family member had confirmed infection prior to attendance*	No
10			OGD	5	Family member had confirmed infection prior to attendance*	No
11			Colonoscopy	8	Hospital staff; returned to work immediately after endoscopy	No
12			Colonoscopy	2	Family member had confirmed infection prior to attendance*	No
13	E	194	ERCP	13	Family member had confirmed infection after attendance*	No
14			ERCP	11	No other likely source identified	Yes
15			OGD	1	Family member had confirmed infection prior to attendance*	No
16	F	472	OGD	4	NHS employee (administrative) with multiple duties in hospital	No

2 – secondary care; 3 – tertiary care; *; .
*Cases known only in retrospect, between preprocedure NPS and attendance.
†History not disclosed by patient prior to attendance (preprocedure telephone questionnaire).
ERCP, endoscopic retrograde pancreatography; OGD, oesophagogastroduodenoscopy.