Table 1.

Comparison of chimeric virus infectivity titers in supernatant fluid from infected JC37 and RC49 cells.

	Titer	(FFU/ml)
Clone	JC37 CCR5low	RC49 CCR5high	Ratio (RC49/JC37)
A1	9.7×104	1.0 ×106	10.31
A2	1.7×105	1.6 ×106	9.41
A20	1.9×103	2.5 ×105	131.58
C66	1.6 ×106	3.7 ×106	2.31
A1-V3-A316T	6.9 ×106	6.7 ×106	0.97
A1-V3-N302K	4.2 ×106	5.4 ×106	1.29
A2-V1-T146I	7.9 ×106	6.2 ×106	0.78
A20-V1Δ5	9.3 ×106	9.9 ×106	1.06