Comparison of the Hemagglutination Inhibition Test and IgG ELISA in Categorizing Primary and Secondary Dengue Infections Based on the Plaque Reduction Neutralization Test

Table 2

Convalescent HI titers and case classification according to PRNT.

HI titers	Cases	PRNT
		⁢Primary infection		⁢Secondary infection
		Cases	%	Cases	%
≤80	11	11	100.0%	0	0.0%
160	4	1	25.0%	3	75.0%
320	14	3	21.4%	11	78.6%
640	14	1	7.1%	13	92.9%
1280	23	0	0.0%	23	100%
≥2560	23	0	0.0%	23	100%