Serum anti-E1a, E1b, E2a, E3a, E4a and E6a IgG responses following immunization with E1+HVR1 with pUCpGs10 and aluminium. Five mice per group were immunized i.m. twice with a 4 week interval. The mice were bled 2 weeks after the third immunization to collect sera for the ELISA. The data are presented as mean serum IgG titres ± SD.