4918
Bedbug ( Cimex lectularius ) samples adult and nymphs either engorged or starved from Central Security Forces sleeping wards , laboratory animal house and control samples from laboratory reared colonies were ground and subjected to ELISA test of hepatitis B surface antigen together with 276 serum samples from the recruits slept in those wards .
 GENE: hepatitis B surface 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 surface antigen