(S (S (NP (BASENP (QP (RB About) (NN 60)) (NN percent)) (PP (IN of) (NP (BASENP (NNP West) (NNP Nile) (NNS cases)) (PP (IN in) (BASENP (DT the) (NNP U.S.)))))) (VP (VBP happen) (PP (IN in) (BASENP (NNP Texas))))) (PERIOD .))