ELISA absorbance values on serum samples. (A) ACH represents a group of 2 animals. ACH.75, ACH.95, and ACH.195 represent a group of 4 animals. PBMC represents a negative control rabbit inoculated with uninfected PBMCs. The data shown are absorbance values from plasma diluted 1:12 000 and determined by anti-HTLV-1 antibody ELISA. ^*Positive antibody titer. (B) The data shown are from the week-8 serum samples. A statistically significant lower antibody titer was seen in ACH.95- and ACH.75-inoculated rabbits compared with wild-type ACH.1-inoculated rabbits (pair-wise comparisons with Bonferroni adjustment, P = .034 and P = .107, respectively). (C) Serial dilution (1:2000 to 1:32 000) comparison of week-8 serum samples from rabbits.