4752
METHODS : All these 30 non - responders received an extra dose of the same vaccine 2 months after primary immunization and a booster dose with a yeast - derived vaccine 6 years later .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None