Table 1. The antibody titers of the rhesus monkeys were measured by ELISA.

Group	First vaccination		Second vaccination				Third vaccination
Antibody titer	0	1:20	0	1:20	1:40	1:80	0	1:20	1:40	1:80
TA	3/4	1/4	1/4	1/4	1/4	1/4	1/4	1/4	1/4	1/4
TB	3/4	1/4	2/4	-	1/4	1/4	-	1/4	3/4	-
TC	2/4	2/4	-	1/4	2/4	1/4	-	1/4	1/4	2/4
CN	4/4	-	4/4	-	-	-	4/4	-	-	-

The numbers of seropositive monkeys were shown.

Each of the groups had 4 monkeys.