(S (S (NP (BASENP (DT The) (NNP United) (NNPS Nations) (NNP World) (NNP Health) (NNP Organization)) (PRN (LRB -LRB-) (BASENP (NNP WHO)) (RRB -RRB-))) (VP (VBD stated) (SBAR (IN that) (S (NP (BASENP (DT the) (NNP H1N1) (NN virus)) (PRN (COMMA ,) (VP (ADVP (RBR more) (RB commonly)) (VP (VBN known) (PP (IN as) (BASENP (NNS swine) (NN flu))))) (COMMA ,))) (VP (VBZ has) (VP (VBN become) (NP (BASENP (DT the) (JJ dominant) (NN flu) (NN strain)) (PP (IN in) (BASENP (DT the) (NN world)))))))))) (PERIOD .))