Serum levels of anti-hepatitis B surface antibodies among vaccinated children aged 1 to 12 years in a rural community in Fars Province, southern Iran

ABSTRACT The present study aimed to find out the levels of anti-HBsAb among vaccinated children in a rural community in Fars Province, Southern Iran. Blood samples were taken from 550 children, aged 1–12 years (mean 6.4 ± 3.5), in 2017 from three villages in the area. A structured questionnaire was used to get the sociodemographic data of the subjects along with determinants concerning the Hepatitis B. Sera samples were examined for anti-HBsAb, using an ELISA commercial kit. Anti-HBsAb were detected in 468 (85.1%) of the subjects. Of the seropositive subjects, 37 (45.1%) were female and 45 (54.9%) were male. In the age group of 0–5 years, 88.7% of the subjects were seropositive. This rate was 84.3% and 78.1% in the age group of 6–10 years old and older than 10 years, respectively. There was a significant association (p < .05) between the anti-HBsAb and age. Findings of the current study revealed that children living in a rural community in southern Iran have appropriate protection against HBV even more than 10 years after being vaccinated. The decline in seropositivity rate of anti-HBsAb with age may further point out the need for a booster dose of HBV vaccine.