among 5005 navy recruits aged 18-26 years from all sections of italy , whose blood was tested in 1981 , regional prevalence of serologic markers for hepatitis b was higher in southern italy and in the italian islands as compared with northern italy and central italy ( 4.3 % vs. 2.3 % for hepatitis b surface antigen ( hbsag ) and 23.5 % vs. 10.5 % for any b marker ) .
C0019163
hepatitis
C0019168
hepatitis b surface antigen