Titration of horse antibodies by S protein ELISA in samples from the first group of animals
(A) Titration up to 131,200-fold dilution of serum samples collected from immunized horses on different days after initial immunization.
(B) Titration up to a 3,542,940-fold dilution of samples collected on day 42 after the first immunization. All results shown are the mean ± standard error for all 5 horses. The negative control was a pool of preimmune sera collected from all 5 horses of Group 1.