Regarding the analysed biochemical markers, at 15 dpi, the infection caused hepatic(ALT and AST) and cardiac (CK-MB) damage, while no renal injury (urea) was detected.The levels of serum ALT, AST and CK-MB in infected animals were 2.4-, 4.2- and2.8-fold higher than those in noninfected animals (Fig. 3). This evidence concerns the gene GPT and infection.