TABLE 4.

Neutralization of SIV239ΔV1-V2^a

Monkey no.	Titer on day of SIV239 challenge
Mm 379-89	1:1,280
Mm 535-99	1:160
Mm 536-99	1:4,480
Mm 117-93	1:17,920
Mm 526-99	1:40
Mm 139-99	Negative
Mm 322-92	Negative
Mm 333-95	Negative
Mm 39-01	Negative

^aDilutions that yielded 50% neutralization with plasma taken on the day of WT SIV239 challenge are shown. Different pools of SIV⁺ rhesus monkey plasma gave titers of 1:17,920 and 1:20,480 when tested in parallel with these assays.