( It ( ( should ( be ( noted ( that ( ( these symptoms ) ( ( are not ) ( ( ( influenza itself ) ( but ( an ( immune response ) ) ) ) ( to ( ( the ( virus proteins ) ) ( in ( the vaccine ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD should) (VP (VB be) (VP (VBN noted) (SBAR (IN that) (S (NP (DT these) (NNS symptoms)) (VP (VBP are) (RB not) (VP (VBG influenza) (NP (PRP itself)) (PP (CC but) (NP (DT an) (JJ immune) (NN response))) (PP (TO to) (NP (NP (DT the) (NN virus) (NNS proteins)) (PP (IN in) (NP (DT the) (NN vaccine)))))))))))) (. .)))
It should be noted that these symptoms are not influenza itself but an immune response to the virus proteins in the vaccine.
(ROOT (S (NP (NP (NNS Symptoms)) (PP (IN of) (NP (JJ viral) (NNS diseases)))) (VP (VBP result) (PP (IN from) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (JJ immune) (NN response))) (PP (TO to) (NP (DT a) (NN virus)))) (. .)))