(S (S (NP (BASENP (NNP Nigeria) (POS 's)) (NN government)) (VP (VBZ has) (VP (VP (VBN requested) (NP (BASENP (NNS assistance)) (PP (IN from) (NP (BASENP (JJ international) (NNS organizations)) (PRN (COMMA ,) (PP (VBG including) (NP (BASENP (DT the) (NNP World) (NNP Health) (NNP Organization)) (CC and) (NP (BASENP (DT the) (NNP US) (NNPS Centers)) (PP (IN for) (NP (BASENP (NNP Disease) (NNP Control)) (CC and) (BASENP (NNP Prevention))))))) (COMMA ,)))))) (PP (IN in) (S (VP (VBG averting) (BASENP (DT a) (JJ widespread) (NN outbreak)))))))) (PERIOD .))