Table 2.

Results of contact investigation

Method	Case	Number of contacts	Number (%) positive	Country	Refs
Respiratory PCR	Outbreak	13	2 (15.4)	Jordan	[2]
Serology	Outbreak	124	9 (7.5)	Jordan	[12]
Respiratory PCR	Index	92	2 (2.2)	UK	17, 22
Respiratory PCR	Secondary	43	0 (0)	UK	2, 17
Respiratory PCR	Index	124	1 (0.8)	France	[14]
Respiratory PCR	Secondary	39	0 (0)	France	[14]
Serology	Index	85	0 (0)	Germany	[16]
Serology	Secondary	83	0 (0)	Germany	[23]
Respiratory PCR	Index secondary	1695 (HCW)a; 462 (family)	19 (1.12); 14 (3.6)	KSA	[7]

^aAbbreviation: HCW, healthcare workers.