Evaluation of hepatitis B surface antibody and specific gamma interferon response in health care workers after vaccination.

BACKGROUND:Health care workers are at high risk of acquiring hepatitis B virus (HBV) infection through occupational exposure to blood or body fluids. Thus, the assessment of anti-HBs status after immunization is very important. OBJECTIVES:This study aimed to evaluate the measurement of HBsAb titer and specific gamma interferon response among the vaccinated health care workers in Golestan Hospital, Ahvaz, Iran. PATIENTS AND METHODS:The blood samples of 39 health care workers, including 13 general surgeons, 10 anesthesiologists, 5 neurosurgeons, 3 general physicians, 1 orthopedist, 2 urologist and 5 nurses were collected during June 2013. All the participants had received HBV vaccine. They had received last vaccine dose from 2 months to 14 years ago. Their sera were tested for anti-hepatitis B antibody and HBc-IgG by the ELISA. Also, the evaluation of specific interferon γ response against HBsAg was carried out using ELISA test. The age of health care workers were between 24 and 58 years with the mean age of 34.3 ± 7.4 y. RESULTS:Out of 39 sera, 22 (56.41%) had HBsAb titer above 100 IU/mL, 17 (43.6%) had titer below 100 IU/mL, 27 (69.2%) had positive specific HBsAg interferon γ, 8 (20.5%) cases had positive antibody response above 100IU, but negative for specific interferon γ and 3 (7.6%) cases were positive for HBc-IgG. CONCLUSIONS:Overall, 87.2% of the health care workers had immunity against HBV infection, which showed remarkable immunity response following HBV vaccination. Booster dose of HBV vaccine is recommended for those whose immunity are below 100 IU/mL.