TABLE 3.

Neutralizing antibodies in rhesus animals after primary infection prior to superinfection

Animal	Primary virus	No. of days of infection	ID50 ina:
			TZM-bl cells infected with SIVmac251/CS.41b	5.25.EGFP.Luc.M7 cells infected with SIVsmE660c
CP3C	SIVsmE660	768	<20	92
CG7G	SIVsmE660	775	<20	508
AK9F	SIVsmE660	748	20	136
CP23	SIVsmE660	768	37	62
CR54	SIVsmE660	105	<20	<20
CP37	SIVsmE660	105	41	79
CP1W	SIVmac251	775	43	245
CT76	SIVmac251	775	50	110
PBE	SIVmac251	748	50	<20
CG71	SIVmac251	105	<20	188
AH4X	SIVmac251	365	33	120
CR53	SIVmac251	762	215	<20
AV74d	SIVmac251	105	<20	73
CG5Gd	SIVmac251	105	<20	124

^aValues are the sample serum dilution at which relative luminescence units (RLU) were reduced 50% compared to virus control wells (no serum sample).

^bPseudoviruses containing Env cloned from single expansion of uncloned SIVmac251 challenge stock were generated in 293T cells.

^cUncloned SIVsmE660 virus stock was generated in CEMx174 cells.

^dResults for monkeys who resisted superinfection are highlighted in boldface.