Safety, Long Term Immunogenicity and Lot Consistency Study of Liquid Pentavalent Combination Vaccine

Inclusion Criteria: * Healthy children in the age group six to eight weeks * Born after a normal gestational period (36 - 42 weeks) * Mother's HBsAg (hepatitis B surface antigen) assured negative. * Father, mother or legally acceptable representative properly informed about the study and having signed the informed consent form. Exclusion Criteria: * Administration of immunoglobulin or any blood products since birth. * Use of any investigational, un-registered drug, or vaccine other than the study vaccine (with the exception of oral polio vaccination OPV \& BCG vaccine) during the study period or within 30 days preceding the first dose of the study vaccine. * Previous vaccination or evidence of infection with DTP or Hib. * History of allergic disease or reaction likely to be exacerbated by any component of the vaccine including allergy to antibiotics. * Major congenital or hereditary immunodeficiency. * Infants born to mothers known to be HIV positive. * Infants having evidence of disease or fever, history of allergic disease or persistent hematological, hepatic, renal, cardiac or respiratory disease and signs of a CNS disorder at the time of vaccination. * Infants showing any of the following reactions after any dose of study vaccine will be withdrawn for subsequent doses: body temperature more than 40.40C, persistent screaming or crying for 3 hours within 48 hours of vaccination, seizures, encephalopathy and hypersensitivity reaction. * Parent/s or guardian of subject unable to maintain diary card