(S (S (S (BASENP (DT These) (NNS symptoms)) (VP (VBD were) (VP (VBN said) (S (VP (TO to) (VP (VB be) (PP (JJ due) (PP (TO to) (QT (DQL ``) (NP (BASENP (DT a) (JJ serious) (JJ viral) (NN infection)) (CC and) (NP (BASENP (JJ chemical) (NNS substances)) (SBAR (WHNP (WDT which)) (S (VP (VP (VBP are) (RB not)) (VP (ADVP (RB normally)) (VP (VBN found) (PP (IN in) (BASENP (NN food) (NNS products)))))))))) (DQR '')))))))))) (SBAR (IN as) (S (BASENP (PRPD his) (NN campaign) (NNS officials)) (VP (VBD put) (BASENP (PRP it)))))) (PERIOD .))