11924
In West Africa , response to specific , geographically appropriate , antivenom is often dramatic following carpet viper ( Echis ocellatus ) envenoming with rapid restoration of blood coagulability and resolution of spontaneous haemorrhage .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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