(S (S (S (NP (BASENP (DT An) (JJ infectious) (NN superbug)) (VP (VBG spreading) (PP (IN in) (BASENP (DT the) (NNP United) (NNPS States))))) (VP (VBZ is) (S (VP (TO to) (VP (QT (DQL ``) (VP (VB emerge) (PP (IN in) (BASENP (NN force)))) (DQR '')) (PP (IN in) (BASENP (NNP Canada)))))))) (COMMA ,) (S (BASENP (NNS doctors)) (VP (VBP fear)))) (PERIOD .))