Comparative Serological Study for the Prevalence of Anti-MERS Coronavirus Antibodies in High- and Low-Risk Groups in Qatar

Table 4

Comparative serological analysis of reactive samples from CC and CP.

	rS1-ELISA	Full virus IIFT		rS1-IIFT	ppNT
Sample identifier	IgG (OD, ratio, endpoint titer)	IgG titer	IgM titer	IgG titer	IC50 titer (EMC/JordanN3)
CC May.2015	(0.61, 1.5, 101)	Quantity not sufficient	Quantity not sufficient	Quantity not sufficient	76/149
CP Mar.2015	(1.084, 2.86, 201)	10000	0	>10000	630/1707
CP May.2015	(0.412, 1.37, ND)	3200	0	320	199/688
CP Feb.2016	(2.229, 6.517, ≥ 3201)	>32000	100	>10000	ND

Positive samples are shown in italic. ND: not determined. This samples showed controversial results in rS1-ELISA IgG and was considered positive based on IIFT.