3817
The relationship between donor status for antibody to hepatitis B core antigen and the occurrence of non - A , non - B posttransfusion hepatitis in the recipient was prospectively studied in 112 patients undergoing open - heart surgery who were followed for 6 . 5 months after surgery .
 GENE: hepatitis B core antigen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: hepatitis B core antigen