الفهرس 
Evaluation of the levels of anti-HBsAb and immunity to HBV among vaccinated residents in Kasr Elaini Medical hospital
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Abstract
Background: The long-term protective effect of hepatitis B virus (HBV) vaccine and the need for booster dose vaccination remain unclear, Health care workers are at high risk of acquiring HBV infection through occupational exposure to blood or body fluids. HBV vaccination is the most effective way to prevent transmission of HBV. Thus assessment of the vaccination status by measuring HBsAb after immunization among health care workers is important. Aim: Evaluation of the levels of anti-HBsAb and immunity to HBV among vaccinated residents in Kasr Al-Aini Medical School. Materials and Methods: cross section study conducted on 202 residents working in Kasr Al-Aini Medical School previously vaccinated against HBV by compulsory and non compulsory vaccination program. Blood samples were collected and serum was tested for HBsAb titer using Elecsys® Anti-HBs II reagent by automated COBAS device system e-601. The studied residents were classified according to their protective antibodies titre into three groups; negative protective titer (< 10IU/L) group, positive low protective titer (10-100 IU/L) group and high positive protective titer (> 100 IU/l) group