TABLE 4.

Titers of antibody to FIV TM peptide, reactivity of plasma samples by immunoblotting, and results of virus isolation at intervals following PET challenge

Inoculum	Finding at indicated wk postchallengea
	Cat	6	9			13
		VI	IB	TM	VI	IB	VI
Pet challenge
PETΔRT + IFNγ	1	+	+	25	+	+	−
	2	+	+	25	+	+	+
	3	+	+	25	+	+	−
	4	+	+	25	+	+	+
	5	+	+	5	+	+	−
	6	−	−	0	−	−	−
GL8ΔRT + IFNγ	1	−	−	0	−	−	−
	2	−	−	0	+	+	−
	3	+	+	25	+	+	+
	4	−	−	0	−	−	−
	5	+	+	25	+	+	+
	6	+	+	5	+	+	+
IFN-γ	1	+	+	25	+	+	+
	2	+	+	5	+	+	−
	3	+	+	5	+	+	+
	4	+	+	5	+	+	+
	5	+	+	25	+	+	+
	6	+	−	25	+	+	−
GL8 challenge
PETΔRT + IFNγ	1	+	+	625	+	+	+
	2	+	+	125	+	+	+
	3	+	+	125	+	+	+
	4	+	ND	ND	ND	ND	ND
	5	+	+	125	+	+	+
	6	+	+	625	+	+	+
GL8ΔRT + IFNγ	1	+	+	625	+	+	+
	2	+	+	625	+	+	+
	3	+	+	625	+	+	+
	4	+	+	25	+	+	+
	5	+	+	625	+	+	+
IFN-γ	1	+	+	625	+	+	+
	2	+	+	625	+	+	+
	3	+	+	625	+	+	+
	4	−	−	0	−	−	−
	5	+	+	625	+	+	+
	6	+	+	625	+	+	+

^aAt the time of challenge, all cats were negative with respect to immunoblotting (IB), presence (titer) of antibody to TM peptide, and virus isolation (VI). ND, not determined.