(S (S (BASENP (NNP Chan)) (VP (PRN (COMMA ,) (ADVP (RB however)) (COMMA ,)) (VP (VBD stressed) (SBAR (S (BASENP (DT the) (NN move)) (VP (VP (VBZ does) (RB not)) (VP (VB indicate) (SBAR (IN that) (S (BASENP (DT the) (NN influenza)) (VP (VBZ has) (VP (VBN become) (ADJP (ADVP (RBR more)) (ADJP (JJ deadly) (CC or) (JJ severe)))))))))))))) (PERIOD .))