Serum platelet-activating factor acetylhydrolase and paraoxonase-1 activity in horses infected with Leptospira spp

► Effect of infection with Leptospira spp. in horses on PAF-AH and PON1 activities. ► Horses with low, residual and high antibody titre were studied. ► No statistical differences in PAF-AH and PON1 activities between groups. ► Low levels of systemic inflammatory response in subclinical leptospirosis.