TABLE 3.

Neutralizing tests at 1,000 TCID₅₀ per well^a

No. of injectionsbefore bleeding	Neutralizing titerb (avg of 2 expt)
0 (preimmune serum)	0
4	30
6	66.8
8	112
12	67.2
14	98
16	189.2

^aNeutralizing tests were done using a 96-well plate at 1,000 TCID₅₀ per well.

^bDetermined by the Reed-Muench method.