(QT (DQL ``) (QTC (S (S (S (BASENP (DT This) (JJ novel) (NN variant)) (VP (MD may) (VP (VB have) (VP (VBN become) (ADJP (JJ dominant)))))) (PERIOD ...)) (SBAR (IN because) (S (BASENP (PRP it)) (VP (VP (VBD was) (RB not)) (ADJP (ADJP (RB as) (ADJP (RB easily) (JJ affected))) (PP (IN as) (NP (BASENP (JJ other) (NNS strains)) (PP (IN by) (NP (BASENP (DT the) (JJ avian) (NN vaccine)) (VP (VBN used) (S (VP (TO to) (VP (VB prevent) (BASENP (NN H5) (NN infection))))))))))))))) (PERIOD .)) (DQR ''))