2739
93 . 4 % pregnant women had the chance to be examined for HBsAg , and the positive rate was 1 . 4 to 1 . 5 % .
 Chemical: HBsAg
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: HBsAg