TABLE 2.

Neutralizing antibody activities in immunized monkeys after the last booster at week 101

Wk	% of plaque reduction in monkeya:
	Group I				Group II
	1	2	3	4	5	6	7	8
102	64.8*	55.6	88.0	92.5	2.99	67.92	61.19	94.0
103	81.3	50.5	91.2	98.7	42.86	76.92	94.51	98.9

^aNeutralizing antibody activities in the plasma samples obtained from immunized monkeys were evaluated by complement-dependent plaque reduction. Plasma samples from each of the four monkeys in groups I and II were assayed at a 1:20 dilution for the ability to reduce the number of plaques compared to that in cells infected with virus alone. The numbers refer to the percentage of plaque reduction at the 1:20 dilution for samples obtained 1 (week 102) and 2 (week 103) weeks after the last DNA immunization at week 101.