Previous publications showed that several Fasciola antigens have been tested for the vaccine against fasciolosis, including fatty acid binding protein (FABP) [9], cathepsins B2 and B3 [10], glutathione S-transferase (GST) [11,12], cathepsin L [13,14,15,16], tetraspanin 2 (TSP2) [17], leucine aminopeptidase (LAP) [18,19,20], and saposin-like protein (SAP) [21,22,23,24,25]. The gene discussed is LAP3; the disease is fascioliasis.