TABLE 1.

Results of serological assays performed on CTF virus antibody-positive sera: comparison of previously reported IgG and neutralizing antibody titers to Western blot analysis and ratios obtained with pVP7 ELISA^a

Serum no.	IgG titerb	NA titerb	WB result	Ratio	Status
10cc	<100	1,280	+	4.0	+
21c	400	128	+	1.5	+
22c	400	128	+	4.8	+
23c	800	320	+	2.9	+
25c	1,600	128	+	5.4	+
31c	800	160	+	6.0	+
32c	3,200	128	+	3.5	+
33c	400	320	+	2.1	+
34c	400	160	+	3.6	+
37c	800	160	+	2.2	+
38c	3,200	160	+	5.3	+
40c	200	10	+	2.8	+
42a	200	80	+	1.2	+
42c	400	320	+	2.2	+
43c	<100	320	+	3.4	+
44c	<100	320	+	3.3	+
48c	12,800	1,280	+	6.0	+
50c	<100	20	NT	1.2	+

^aLetters following serum sample numbers indicate acute (a) and convalescent (c) phase. +, positive; −, negative; NT, not tested (not enough volume); NA, neutralizing antibody; WB, Western blot.

^bData from Calisher et al. (7).

^cSerum used for interseries normalization.