1844
RESULTS With a 10 % uptake rate , the intervention will vaccinate 528 , 047 people and prevent 4 , 271 acute and 256 chronic hepatitis B infections .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None