698
In the animals that received the control vaccine , i . e . the same vectors , but not expressing the virus proteins , all of the animals had died within six days after challenge .
 None
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:
 None