Serial dilutions starting at 1:50 of donkey sera were analyzed for Besnoitia antibodies by IFAT using fluorescein (FITC)-conjugate solution [affinity purified goat anti-horse IgG (H + L) (Jackson ImmunoResearch Laboratories, West Grove, USA; diluted 1:50 in PBS)]. The procedure was performed as previously described [10 (link)]. Sera from infected or non-infected donkeys were used as positive and negative controls, respectively, sampled during a besnoitiosis outbreak in north-eastern Pennsylvania [7 (link)].
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