700
Scientists must do far more research on this vaccine before a version of it might be used to prevent the disease in humans .
 person: Scientists; person: humans
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 person: Scientists; person: humans