(S (S (ADVP (RB So) (RB far)) (S (NP (BASENP (PDT all) (DT those)) (VP (VBN infected))) (VP (VBP appear) (S (VP (TO to) (VP (VB be) (NP (NP (BASENP (NNS horses)) (VP (VBN used) (PP (IN for) (BASENP (JJ recreational) (NNS purposes))))) (CC and) (BASENP (ADJP (RB not) (JJ thoroughbred)) (NN race) (NNS horses))))))))) (PERIOD .))