Table 4. Comparison of mean IC₅₀ titers of superinfected and singly infected study subjects against heterologous and autologous viruses.

Subject ID	Plasma sample	Mean IC50 against heterologous viruses (n = 6)	Fold increase	Mean IC50 against autologous pseudoviruses (n = 8–12)	Fold increase
Superinfected
CMNYU107	First plasma	10	55	10	4
	Last plasma	550*		38*
CMNYU6518	First plasma	38	12	12	8
	Last plasma	459*		92*
CMNYU129	First plasma	10	0	32	4
	Last plasma	10		123
CMNYU6544	First plasma	10	25	54	0
	Last plasma	251*		47
Singly-infected
CMNYU133	First plasma	21	0	236	2
	Last plasma	10		442*
CMNYU179	First plasma	10	0	14	4
	Last plasma	10		57*
CMNYU153	First plasma	13	0	10	5
	Last plasma	15		47*
CMNYU6542	First plasma	16	0	13	37
	Last plasma	12		483*

IC₅₀ titers against heterologous viruses were taken from the following publication: Powell, R. L., T. Kinge, and P. N. Nyambi. 2010. Infection by discordant strains of HIV-1 markedly enhances the neutralizing antibody response against heterologous virus.