Abstract
The aim of the present study was to identify the true extent of the non-responsiveness in infants born from HBsAg-negative mothers, vaccinated against Hepatitis B Virus (HBV) at birth. Sixty-four non- and low-responding infants, selected from an initial cohort of 2009, were given two additional doses of recombinant HBV vaccine between the tenth and the twelfth month of age. A parallel evaluation was conducted on the response to anti-rubella and anti-tetanus vaccine. Only two infants remained non-responders, whereas 68% of the non-responders and 94% of the low responders after the primary vaccination schedule developed antibody titres over 100 mIU ml −1. No significant relationship between the specific antibody level against HBV and against rubella or tetanus 1 month after vaccination was observed.
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