(S (S (NP (BASENP (DT Some) (NNS symptoms)) (PP (IN of) (BASENP (NN exposure)))) (VP (MD can) (VP (VB include) (NP (NP (NP (NP (NP (NP (BASENP (NN vomiting)) (CC and) (BASENP (NN dehydration))) (COMMA ,) (BASENP (NN sweating))) (COMMA ,) (BASENP (NN nausea))) (COMMA ,) (BASENP (NN fever))) (COMMA ,) (BASENP (NN cough))) (CC and) (NP (BASENP (NN difficulty)) (PP (IN of) (BASENP (NN breathing)))))))) (PERIOD .))