The outbreak is unrelated to the one that began spreading from Nigeria in 2004 through several countries in central Africa and the Arabian peninsula , and is unusual in that it is striking mostly adults , according to the World Health Organization .
Africa /location/location/contains Nigeria
DT NN VBZ JJ TO DT CD WDT VBD VBG IN NNP IN CD IN JJ NNS IN JJ NNP CC DT JJ NN , CC VBZ JJ IN IN PRP VBZ JJ RB NNS , VBG TO DT NNP NNP NNP .
Africa
LOCATION
Nigeria
LOCATION
/location/location/contains