This procedure carried out according to the procedures of Lard et al. [32]. Briefly, ELISA plate was coated with 50 μl of the antigen was dispensed into the wells of ELISA microplates. After incubation at 4°C overnight, the microplate was washed with phosphate-buffered saline (PBS) containing 0.05% Tween 20 (PBS-T) (washing buffer) 3-4 time. 100 μl of diluted 1/100 sheep, goat and human serum samples were added to each well. Dilutions of negative and positive control sera were 1/100. After incubation for 60 min at 37°C after incubation wash the plate with washing buffer. 100 μl peroxidase-conjugated protein A or anti-human conjugated with horseradish peroxidase (Sigma, Aldrich, Germany) diluted with phosphate-buffered saline (PBS) containing 0.05% Tween 20. The plate was incubated further for 60 min at 37°C and then washed by washing buffer. A freshly prepared substrate solution100 μl of orthophenylenediamine (OPD), (Sigma Aldrich Germany) was added and the plates were left in the dark (10-15 min) at room temperature until color well developed in the positive control wells. The reaction was then stopped by adding 50 μl of 5% sodium dodecyl sulfate and the optical density (OD) of each well was determined with a micro-ELISA plate reader at a test wavelength of 414 nm.