[Distribution characteristics of hepatitis B surface antigen positivity in Bursa].

The ratio of HBsAg positivity among 9978 healthy blood donors by indirect hemagglutination (IHA) method was 4.8%. Positivity was 4.4% among donors coming from districts in Bursa. Positivity was higher among donors coming from boarding societies and villages (6.1% and 8.1%), they were significant (p less than 0.05 and p less than 0.001). The highest positivity was found at the age group between 16-25 years (6%). With older ages, positivity becomes less (at the age over 46 ratio was 2.5%) and it was significant (p less than 0.001).